thumb
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(thŭm) 
n.
v., thumbed, thumb·ing, thumbs. v.tr.
n.
- The short thick digit of the human hand, next to the index finger and opposable to each of the other four digits.
- A corresponding digit in other animals, especially primates. Also called pollex.
- The part of a glove or mitten that covers the thumb.
- Architecture. An ovolo.
v., thumbed, thumb·ing, thumbs. v.tr.
- To scan (written matter) by turning over pages with or as if with the thumb.
- To disarrange, soil, or wear by careless or frequent handling.
- Informal. To solicit (a ride) from a passing vehicle by signaling with the thumb.
- To scan written matter by turning over pages with or as if with the thumb: thumbed through the latest issue of the magazine.
- Informal. To hitchhike.
all thumbs
- Lacking physical coordination, skill, or grace; clumsy.
- To express scorn or ridicule by or as if by placing the thumb on the nose and wiggling the fingers.
- An expression of rejection, refusal, or disapproval.
- An expression of approval, success, or hope.
- Under the control of someone; subordinate to.
[Middle English, from Old English thūma.]
Roget's Thesaurus:
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thumb
verb
- To look through reading matter casually. browse, dip into, flip through, glance at (or over) (or through), leaf (through), riffle (through), run through, scan, skim. See investigate, words.
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Idioms beginning with thumb:
thumb a ride
thumbnail sketch
thumb one's nose
See also all thumbs; green thumb; rule of thumb; stick out (like a sore thumb); twiddle one's thumbs; under someone's thumb.
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The slider on a window-system scrollbar. So called because moving it allows you to browse through the contents of a text window in a way analogous to thumbing through a book.
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A surprising number of gestures and practices of past times involved the thumb. The folding of the thumb into the palm of the hand, with the other fingers closed over it, was believed to be a protection against witches, or general evil:
Some years ago, children in Northumberland were taught to double the thumb within the hand as a preservative from danger, and especially to repel sorcery. It was the custom also to fold the thumbs of dead persons within the hand for the same purpose …'. (W. Hutchinson, View of Northumberland (1778), quoted in Lean, 1903:ii. 456)
Opie and Tatem give a number of references to this action, commencing with one dated c.1350 and running up through the 19th century, although on the strength of the available information it would seem to have been a mainly north country or Scottish practice. The idea that a part of the body itching signifies a future event is well attested in English lore, and this combined with the protective thumb in the hand presumably explains Shakespeare's lines ‘By the pricking of my thumbes, Something wicked this way comes’ (Macbeth iv. i). Nineteenth- and 20th-century references to holding or squeezing thumbs are more akin in meaning to the modern crossing fingers for luck.
Another Shakespeare quotation, ‘I will bite my thumb at them, which is disgrace to them if they bear it’ (Romeo and Juliet, i. i) indicates another gesture, meaning a challenge or insult, which is well attested in Britain from the 16th to 18th centuries. Morris equates this with the ‘teeth flick’ gesture current in many parts of Europe.
The thumbs-up gesture, to signify assent or ‘OK’ is so well accepted that few English people would even question its meaning. The popular, but incorrect, explanation is that it dates from Roman times, when the crowd would signify the fate of a vanquished gladiator by thumbs up or down. What they did in that context was either hide theirthumbs in their hand, or extend them, although there are other Latin sources which speak of other thumb gestures. In the absence of the spurious antiquity given the gesture by the Roman connection, all we can be sure of is that it existed in England in the mid-17th century, as the earliest reasonably unambiguous reference to ‘thumbs up’ in England is found in John Bulwer's Chirologia (1644) ‘To hold up the thumbe is the gesture … of one shewing his assent or approbation. To hold up both thumbs, is an expression imparting a transcendency of praise’ (quoted in Morris, 1979: 191). Another thumb gesture may hold the key to further elucidation. In previous times, a regular method for two people to seal a bargain was for them to wet their thumbs and press them together—summed up by the phrase ‘Here's my thumb on it’. This certainly signifies agreement, and Hazlitt (1905: 586-7) provides a reference to the custom in a letter in the Close Rolls of King John, dated 1208, and it continues to be reported until at least the late 19th century, although again most of the references are Scottish.
The raised thumb could also be a form of greeting: ‘It is still the custom—or was fifty years ago in the North of England—for coachmen whose hands are occupied driving to salute a comrade by raising the thumb’ (N&Q 160 (1931), 393).
Other thumb lore includes the 17th- and 18th- century custom of widows signifying their status by wearing a thumb-ring (Hazlitt, 1905: 586-7), and in the post-Second World War period, the erect thumb has also become the international sign of the hitch-hiker, although in some parts of southern Europe it is considered an obscene gesture (see Morris, 1979).
See also FINGERS.
Bibliography
The full bibliography list is available here.
- Opie and Tatem, 1989: 404
- Morris, 1979: 186-204
- Hazlitt, 1905: 586-7
- Chambers, 1878:
i. 358-60 - N&Q
160 (1931), 190-1, 231, 286, 393
Word Tutor:
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thumb
IN BRIEF: The short, thick finger nearest the wrist.
At no time is freedom of speech more precious than when a man hits his thumb with a hammer.
— Marshall Lumsden
LearnThatWord.com is a free vocabulary and spelling program where you only pay for results!
Sign Language Videos:
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thumb
sign description: The index finger points to the thumb on the opposite hand.
Dictionary of Cultural Literacy: Science:
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opposable thumb
A thumb that can be used for grasping.
Random House Word Menu:
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categories related to 'thumb'
- Limbs and Extremities - thumb: short, thick digit of hand nearest wrist, in opposition to other fingers
- Boxing and Wrestling
See crossword solutions for the clue
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For other uses, see Thumb (disambiguation).
| Thumb | |
|---|---|
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| The Thumb. | |
| Latin | pollex, digitus primus, digitus I |
| Artery | princeps pollicis artery |
| Lymph | infraclavicular lymph nodes[1] |
| MeSH | Thumb |
The thumb is the first digit of the hand. When a person is standing in the medical anatomical position (where the palm is facing anteriorly), the thumb is the lateral-most digit. The Medical Latin English noun for thumb is pollex (compare hallux for big toe), and the corresponding adjective for thumb is pollical.
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Definition
As one of five digits, and as companion to four other fingers
The English word "finger" has two senses, even in the context of appendages of a single typical human hand:
- Any of the five digits.
- Any of the five terminal members of the hand, especially those other than the thumb.
Linguistically, it appears that the original sense was the broader of these two: penkwe-ros (also rendered as penqrós) was, in the inferred Proto-Indo-European language, a suffixed form of penkwe (or penqe), which has given rise to many Indo-European-family words (tens of them defined in English dictionaries) that involve or flow from concepts of fiveness.
The thumb shares the following with each of the other four fingers:
- Having a skeleton of phalanges, joined by hinge-like joints that provide flexion toward the palm of the hand
- Having a "back" surface that features hair and a nail, and a hairless palm-of-the-hand side with fingerprint ridges instead
The thumb contrasts with each of the other four by being the only digit that:
- Is opposable to the other four fingers
- Has two phalanges rather than three
- Has greater breadth in the distal phalanx than in the proximal phalanx
- Is attached to such a mobile metacarpus (which produces most of the opposability)
and hence the etymology of the word: "tum" is Proto-Indo-European for " swelling " (cf "tumour" and "thigh") since the thumb is the stoutest of the digits.
Opposition and apposition
In humans, opposition and apposition are two movements unique to the thumb but these words are not synonyms:
Primatologists and hand research pioneers J. Napier and P. Napier defined opposition as: "A movement by which the pulp surface of the thumb is placed squarely in contact with - or diametrically opposite to - the terminal pads of one or all of the remaining digits." For this true, pulp-to-pulp opposition to be possible, the thumb must rotate about its long axis (at the carpometacarpal joint).[3] Arguably, this definition was chosen to underline what is unique to the human thumb.
Anatomists and other researchers focused exclusively on human anatomy, on the other hand, tend to elaborate this definition in various ways and, consequently, there are hundreds of definitions.[4] Some anatomists[5] restrict opposition to when the thumb is approximated to the fifth digit (little finger) and refer to other approximations between the thumb and other digits as apposition. To anatomists, this makes sense as two intrinsic hand muscles are named for this specific movement (the opponens pollicis and opponens digiti minimi respectively).
Other researchers use another definition,[4] referring to opposition-apposition as the transition between flexion-abduction and extension-adduction; the side of the distal thumb phalanx thus approximated to the palm or the hand's radial side (side of index finger) during apposition and the pulp or "palmar" side of the distal thumb phalanx approximated to either the palm or other digits during opposition.
Moving a limb back to its neutral position is called reposition and a rotary movement is referred to as circumduction.
Human anatomy
Skeleton
The skeleton of the thumb consists of the first metacarpal bone which articulates proximally with the carpus at the carpometacarpal joint and distally with the proximal phalanx at the metacarpophalangeal joint. This latter bone articulates with the distal phalanx at the interphalangeal joint. Additionally, there are two sesamoid bones at the metacarpophalangeal joint.
Muscles
The muscles of the thumb can be compared to guy-wires supporting a flagpole; tension from these musclular guy-wires must be provided in all directions to maintain stability in the articulated column formed by the bones of the thumb. Because this stability is actively maintained by muscles rather than by articular constraints, most muscles attached to the thumb tend to be active during most thumb motions.[6]
The muscles acting on the thumb can be divided into two groups: The extrinsic hand muscles, with their muscle bellies located in the forearm, and the intrinsic hand muscles, with their muscles bellies located in the hand proper.[7]
Extrinsic
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Flexor pollicis longus (left) and deep muscles of dorsal forearm (right)
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A ventral forearm muscle, the flexor pollicis longus (FPL) originates on the anterior side of the radius distal to the radial tuberosity and from the interosseous membrane. It passes through the carpal tunnel in a separate tendon sheath, after which it lies between the heads of the flexor pollicis brevis. It finally attaches onto the base of the distal phalanx of the thumb. It is innervated by the anterior interosseus branch of the median nerve (C7-C8)[8]
Three dorsal forearm muscles act on the thumb:
The abductor pollicis longus (APL) originates on the dorsal sides of both the ulna and the radius, and from the interosseous membrane. Passing through the first tendon compartment, it inserts to the base of the first metacarpal bone. A part of the tendon reaches the trapezium, while another fuses with the tendons of the extensor pollicis brevis and the abductor pollicis brevis. Except for abducting the hand, it flexes the hand towards the palm and abducts it radially. It is innervated by the deep branch of the radial nerve (C7-C8).[9]
The extensor pollicis longus (EPL) originates on the dorsal side of the ulna and the interosseous membrane. Passing through the third tendon compartment, it is inserted onto the base of the distal phalanx of the thumb. It uses the dorsal tubercle on the lower extremity of the radius as a fulcrum to extend the thumb and also dorsiflexes and abducts the hand at the wrist. It is innervated by the deep branch of the radial nerve (C7-C8).[9]
The extensor pollicis brevis (EPB) originates on the ulna distal to the abductor pollicis longus, from the interosseus membrane, and from the dorsal side of the radius. Passing through the first tendon compartment together with the abductor pollicis longus, it is attached to the base of the proximal phalanx of the thumb. It extends the thumb and, because of its close relationship to the long abductor, also abducts the thumb. It is innervated by the deep branch of the radial nerve (C7-T1).[9]
The tendons of the extensor pollicis longus and extensor pollicis brevis form what is known as the anatomical snuff box (an indentation on the lateral aspect of the thumb at its base) The radial artery can be palpated anteriorly at the wrist(not in the snuffbox).
Intrinsic
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Thenar (left) and dorsal interossei (right) muscles
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There are four thenar muscles:
The abductor pollicis brevis (APB) originates on the scaphoid tubercle and the flexor retinaculum. It inserts to the radial sesamoid bone and the proximal phalanx of the thumb. It is innervated by the median nerve (C8-T1).[10]
The flexor pollicis brevis (FPB) has two heads. The superficial head arises on the flexor retinaculum, while the deep head originates on three carpal bones: the trapezium, trapezoid, and capitate. The muscle is inserted onto the radial sesamoid bone of the metacarpophalangeal joint. It acts to flex, adduct, and abduct the thumb, and is therefore also able to oppose the thumb. The superficial head is innervated by the median nerve, while the deep head is innervated by the ulnar nerve (C8-T1).[10]
The adductor pollicis also has two heads. The transversal head originates along the entire third metacarpal bone, while the oblique head originates on the carpal bones proximal to the third metacarpal. The muscle is inserted onto the ulnar sesamoid bone of the metacarpophalangeal joint. It adducts the thumb, and assists in opposition and flexion. It is innervated by the deep branch of the ulnar nerve (C8-T1).[10]
The opponens pollicis originates on the tubercle of the trapezium and the flexor retinaculum. It is inserted onto the radial side of the first metacarpal. It opposes the thumb and assists in adduction. It is innervated by the median nerve.[10]
The first dorsal interosseous, one of the central muscles of the hand, extends from the base of the thumb metacarpal to the radial side of the proximal phalanx of the index finger.[11]
Variation
"Hitchhiker's thumb" is an autosomal recessive trait more formally known as "distal hyperextensibility of the thumb".[12] Homozygous carriers can extend the top of the thumb backwards nearly 90° when the thumb is extended in a "thumbs-up". Cases of Hitchhiker's thumb are subject to a variation in range of motion. Some who have this condition are able to hyperextend thumbs backwards 90° while still able to bend thumbs forward partially or with an added normal forward range of motion. Those with a more traditional case of Hitchhiker's thumbs can hyperextend backwards 90° while unable to bend past a straight position of the thumb.[13] Malformations include a triphalangeal thumb and polydactyly.
Grips
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Left: In a power grip the object is in contact with the palm.
Right: Cricketer Jack Iverson's "bent finger grip", an unusual pad-to-side precision grip designed to confuse batsmen. |
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One of the earlier significant contributors to the study of hand grips was orthopedic primatologist and paleoathropologist John Napier who proposed organizing the movements of the hand by their anatomical basis as opposed to work done earlier that had only used arbitrary classification.[14] Most of this early work on hand grips had a pragmatic basis as it was intended to narrowly define compensable injuries to the hand, which required an understanding of the anatomical basis of hand movement. Napier proposed two primary prehensile grips: the precision grip and the power grip.[15] The precision and power grip are defined by the position of the thumb and fingers where:
- The power grip is when the fingers (and sometimes palm) clamp down on an object with the thumb makes counter pressure. examples of the power grip are gripping a hammer, opening a jar using both your palm and fingers, and during pullups.
- The precision grip is when the intermediate and distal phalanges ("fingertips") and the thumb press against each other. Examples of a precision grip are writing with a pencil, opening a jar with the fingertips alone, and gripping a ball (only if the ball is not tight against the palm).
Opposability of the thumb should not be confused with a precision grip as some animals possess semi-opposable thumbs yet are known to have extensive precision grips (Tufted Capuchins for example).[16] Nevertheless, precision grips are usually only found in higher apes, and only in degrees significantly more restricted than in humans.[17]
Evolution
The opposable thumb has helped the human species develop more accurate fine motor skills. It is also thought to have directly led to the development of tools, not just in humans or their evolutionary ancestors, but other primates as well. The opposable thumb ensured that important human functions such as writing were possible.[18][19] The thumb, in conjunction with the other fingers, makes human hands and those of other species with similar hands some of the most dexterous in the world.[20]
A primitive autonomization of the first carpometacarpal joint (CMC) may have occurred in dinosaurs. A real differentiation appeared perhaps 70 mya in early primates, while the shape of the human thumb CMC finally appears about 5 mya. The result of this evolutionary process is a human CMC joint positioned at 80° of pronation, 40 of abduction, and 50° of flexion in relation to an axis passing through the second and third CMC joints.[21]
Opposable thumbs are shared by many primates, including most simians, and some prosimians. The climbing and suspensory behaviour in orthograde apes, such as chimpanzees, has resulted in elongated hands while the thumb has remained short. As a result, these primates are unable to perform the pad-to-pad grip associated with opposability. However, in pronograde monkeys such as baboons, an adaptation to a terrestrial lifestyle has led to reduced digit length and thus hand proportions similar to those of humans. Consequently, these primates have dexterous hands and are able to grasp objects using a pad-to-pad grip. It can thus be difficult to identify hand adaptations to manipulation-related tasks based solely on thumb proportions.[22]
The evolution of the fully opposable thumb is usually associated with Homo habilis, the forerunner of Homo sapiens.[23][24] This, however, is the suggested result of evolution from Homo erectus (around 1 mya) via a series of intermediate anthropoid stages, and is therefore a much more complicated link.
It is possible, though, that a more likely scenario may be that the specialized precision gripping hand (equipped with opposable thumb) of Homo habilis preceded walking, with the specialized adaptation of the spine, pelvis, and lower extremities preceding a more advanced hand. And, it is logical that a conservative, highly functional adaptation be followed by a series of more complex ones that complement it. With Homo habilis, an advanced grasping-capable hand was accompanied by facultative bipedalism, possibly implying, assuming a co-opted evolutionary relationship exists, that the latter resulted from the former as obligate bipedalism was yet to follow.[25] Walking may have been a by-product of busy hands and not vice versa.
HACNS1 (also known as Human Accelerated Region 2) is a gene enhancer "that may have contributed to the evolution of the uniquely opposable human thumb, and possibly also modifications in the ankle or foot that allow humans to walk on two legs". Evidence to date shows that of the 110,000 gene enhancer sequences identified in the human genome, HACNS1 has undergone the most change during the human evolution since the chimpanzee-human last common ancestor.[26]
Other animals with opposable digits
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Many animals also have some kind of opposable thumb or toe. An animal species is said to have opposable thumbs if the thumb is capable of bending in such a way that it can touch all the other digits on the hand. Most species do not have opposable thumbs. Opposable thumbs are a signature feature of the primate family, and played a large role in the ancient humans' invention and use of tools.
- Primates
- Primates fall into one of four groups:[27]
- Nonopposable thumbs: tarsiers and marmosets
- Pseudo-opposable thumbs: all strepsirrhines and Cebidae
- Opposable thumbs: Old World monkeys and all great apes
- Opposable with comparatively long thumbs: gibbons (or lesser apes)
Darwinius masillae, an Eocene primate fossil often described as a missing link between prosimian and simian, had hands and feet with highly flexible digits featuring opposable thumbs and halluces.[28][dubious ][undue weight? ]
- Other placental mammals
- Giant Pandas — five clawed fingers plus an extra-long sesamoid bone beside the true first digit that, though not a true digit, works like an opposable thumb.[29]
- Lophiomys — a genus of African cricetid (rodent), with only one extant species (Lophiomys imhausi), but several extinct species, with opposable halluces.[30]
Additionally, in many polydactyl cats, both the innermost and outermost ("pinky") toes may become opposable, allowing the cat to perform more complex tasks.
- Marsupials
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Left: Opposable digits of Sulawesi Bear Cuscus forelimb
Right: Opposable thumb on rear foot of an opossum |
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- In most phalangerid marsupials (a family of possums) except species Trichosurus and Wyulda the first and second digits of the forefoot are opposable to the other three. In the hind foot, the first toe is clawless but opposable and provides firm grip on branches. The second and third toes are partly syndactylous, united by skin at the top joint while the two separate nails serve as hair combs. The fourth and fifth digits are the largest of the hind foot.[31]
- Similar to phalangerids though in a different order, koalas have five digits on their fore and hind feet with sharp curved claws except for the first digit of the hind foot. The first and second digits of the forefeet are opposable to the other three, which enables the koala to grip smaller branches and search for fresh leaves in the outer canopy. Similar to the phalangerids, the second and third digits of the hind foot are fused but have separate claws.[32]
- Opossums are New World marsupials with opposable thumbs in the hind feet giving these animals their characteristic grasping capability (with the exception of the Water Opossum, the webbed feet of which restrict opposability).[33]
- The mouse-like microbiotheres were a group of South American marsupials most closely related to Australian marsupials. The only extant member, Dromiciops gliroides, is not closely related to opossums but has paws similar to these animals, each having opposable toes adapted for gripping.[34]
- Reptiles
- Troodon — a birdlike dinosaur — partially opposable thumbs.
- Bambiraptor — a small, predatory dinosaur — it could touch the outer two of its three digits together in an opposable grip.
- Nqwebasaurus — a coelurosaur with a long, three-fingered hand which included a partially opposable thumb (a "killer claw").[35]
Most birds have at least one opposable digit on the foot, in various configurations, but these are seldom called "thumbs".
- Amphibians
- Phyllomedusa, a genus of frogs native to South America.[36]
See also
Notes
- ^ clinicalconsiderations at The Anatomy Lesson by Wesley Norman (Georgetown University)
- ^ "The Thumb is the Hero". The New York Times. January 11, 1981. http://query.nytimes.com/gst/fullpage.html?res=9F04E3D8173BF932A25752C0A967948260. Retrieved November 2010. "The "fishing rod" a chimp strips of leaves and pokes into a termite nest to bring up a snack is as far as he'll ever get toward orbiting the planets."
- ^ "Primates FAQ: Do any primates have opposable thumbs?". Wisconsin Regional Primate Research Center. http://www.primates.com/faq/. Retrieved November 2010.
- ^ a b van Nierop et al. 2008, p. 34
- ^ Brown et al. 2004
- ^ Austin 2005, p. 339
- ^ "Muscles of the thumb". Eaton hand. http://www.eatonhand.com/mus/mus131.htm. Retrieved April 2010.
- ^ Platzer 2004, p. 162
- ^ a b c Platzer 2004, p. 168
- ^ a b c d Platzer 2004, p. 176
- ^ Platzer 2004, p. 174
- ^ "Thumb, Distal Hyperextensibility of". OMIM. NCBI. http://www.ncbi.nlm.nih.gov/entrez/dispomim.cgi?id=274200. Retrieved 5 February 2010.
- ^ Hsu 2008, p. S148
- ^ Slocum & Pratt 1946, McBride 1942, p. 631
- ^ Napier 1956, pp. 902–913
- ^ Costello & Fragaszy 1988, pp. 235–245
- ^ Young 2003, pp. 165–174, Christel, Kitzel & Niemitz 2004, pp. 165–194, Byrne & Byrne 1993, p. 241
- ^ "Lesson Plans — Chimps, Humans, Thumbs, and Tools". National Geographic. 2006. http://www.nationalgeographic.com/xpeditions/lessons/01/g68/lonsdorf.html. Retrieved April 26, 2007.
- ^ Damonte, Kathleen (February 2004). "Thumbs Are Handy Digits". National Science Teachers Association: Science & Children: The Elementary Science Classroom. http://www.nsta.org/main/news/stories/science_and_children.php?news_story_ID=49036. Retrieved April 26, 2007.
- ^ Chaisson, Eric J. (2007). "Cosmic Evolution — Epoch 6 - Biological Evolution". Tufts University. http://www.tufts.edu/as/wright_center/cosmic_evolution/docs/text/text_bio_6.html. Retrieved April 26, 2007.
- ^ Brunelli 1999, p. 167
- ^ Moyà-Solà, Köhler & Rook 1999, pp. 315–6
- ^ Wills, Christopher. "The Evolution of the Human Species (from Evolutionary Theory Conference Summary)". Esalen Center for Theory & Research. http://www.esalenctr.org/display/confpage.cfm?confid=10&pageid=103&pgtype=1.
- ^ "Hominids". The NEXUS: Technology Timeline. http://www.fortunecity.com/tatooine/acegarp/898/hominids.htm. Retrieved December 2009.
- ^ Harcourt-Smith & Aiello 2004
- ^ "HACNS1: Gene enhancer in evolution of human opposable thumb". Science Codex. September 4, 2008. http://www.sciencecodex.com/gene_enhancer_in_evolution_of_human_opposable_thumb. Retrieved December 2009.
- ^ Ankel-Simons 2007, p. 345
- ^ Franzen et al. 2009, pp. 15–18
- ^ "The Panda's Thumb". Athro. 2000. http://www.athro.com/evo/pthumb.html. Retrieved November 2010.
- ^ Flower, William Henry; Lydekker, Richard (1891). An Introduction to the Study of Mammals Living and Extinct. A. and C. Black. ISBN 978-1-4400-5891-2. http://books.google.com/books?id=jeTjaFiNZtwC&pg=PA460.
- ^ Nowak 1999, p. 89
- ^ McDade 2003, vol 13, p. 44
- ^ McDade 2003, vol 12, p. 250
- ^ McDade 2003, vol 12, p. 274
- ^ de Klerk et al. 2000, p. 327. The left manus shows that the flexed digit I had the potential to partially oppose digits II and III.
- ^ Bertoluci, Jaime (18). "Phyllomedusa". Journal of Herpetology. 2 1. http://www.revistasusp.sibi.usp.br/scielo.php?pid=S1519-13972002000200005&script=sci_arttext.
References
-
- Ankel-Simons, Friderun (2007). "Chapter 8: Postcranial Skeleton". Primate Anatomy (3rd ed.). Academic Press. p. 345. ISBN 0-12-372576-3.
- Austin, Noelle M. (2005). "Chapter 9: The Wrist and Hand Complex". In Levangie, Pamela K.; Norkin, Cynthia C.. Joint Structure and Function: A Comprehensive Analysis (4th ed.). Philadelphia: F. A. Davis Company. ISBN 0-8036-1191-9.
- Brown, David P.; Freeman, Eric D.; Cuccurullo, Sara; Freeman, Ted L. (2004). "Upper Extremities—Hand Region: Range of Motion of the Digits". In Cuccurullo, Sara. Physical Medicine and Rehabilitation Board Review. Demos Medical Publishing. ISBN 1-888799-45-5. http://www.ncbi.nlm.nih.gov/bookshelf/br.fcgi?book=physmedrehab&part=A4492#A4530. (NCBI)
- Brunelli, Giovanni R. (1999). "Stability in the first carpometacarpal joint". In Brüser, Peter; Gilbert, Alain. Finger bone and joint injuries. Taylor & Francis. ISBN 1-85317-690-7. http://books.google.com/books?id=-pzGRMvXFzAC&pg=PA167.
- Byrne, R.W.; Byrne, J.M.E. (1993). "Complex Leaf-Gathering Skills of Mountain Gorillas (Gorilla g. beringei): Variability and Standardization". American Journal of Primatology (John Wiley & Sons) 31 (4): 241. DOI:10.1002/ajp.1350310402. ISSN 0275-2565. http://www.st-andrews.ac.uk/~www_sp/people/personal/rwb/publications/1993%20Byrne_Byrne_AJP.pdf.
- Christel, Marianne I.; Kitzel, Stefanie; Niemitz, Carsten (30 November 2004). "How Precisely do Bonobos (Pan paniscus) Grasp Small Objects?". International Journal of Primatology 19 (1): 165–194. DOI:10.1023/A:1020319313219. http://www.springerlink.com/content/w06281n1m71n7418/.
- Costello, Michael B.; Fragaszy, Dorothy M. (March 1988). "Prehension in Cebus and Saimiri: I. Grip type and hand preference". American Journal of Primatology (Wiley-Liss) 15 (3): 235–245. DOI:10.1002/ajp.1350150306. http://www3.interscience.wiley.com/cgi-bin/fulltext/110487513/PDFSTART.
- de Klerk, W.J.; Forster, C.A.; Sampson, S.D.; Chinsamy, A.; Ross, C.F. (2000). "A new coelurosaurian dinosaur from the Early Cretaceous of South Africa". Journal of Vertebrate Paleontology 2 (20): 324–332. http://rosslab.uchicago.edu/pdf/deklerketal2000.pdf.
- Franzen, JL; Gingerich, PD; Habersetzer, J; Hurum, JH; von Koenigswald, W, et al. (2009). Hawks, John. ed. "Complete Primate Skeleton from the Middle Eocene of Messel in Germany: Morphology and Paleobiology". PLoS ONE 4 (5): e5723. Bibcode 2009PLoSO...4.5723F. DOI:10.1371/journal.pone.0005723. PMC 2683573. PMID 19492084. //www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=2683573.
- Harcourt-Smith, W E H; Aiello, L C (May 2004). "Fossils, feet and the evolution of human bipedal locomotion". Journal of anatomy (J Anat) 204 (5): 403–16. DOI:10.1111/j.0021-8782.2004.00296.x. PMC 1571304. PMID 15198703. http://www3.interscience.wiley.com/resolve/openurl?genre=article&sid=nlm:pubmed&issn=0021-8782&date=2004&volume=204&issue=5&spage=403.
- Hsu, Ar-Tyan; Meng-Tsu Hu, Fong Ching Su (July 2008). "Effect of Gender, Flexibility and Thumb Type on Thumb Tip Generation". Journal of Biomechanics 41 (Supplement 1): S148. DOI:10.1016/S0021-9290(08)70148-9. http://www.jbiomech.com/article/S0021-9290%2808%2970148-9/abstract.
- McBride, Earl Duwain (1942). Disability evaluation: principles of treatment of compensable injuries. Lippincott. pp. 631. http://books.google.com/books?id=YIpgQgAACAAJ.
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- Moyà-Solà, Salvador; Köhler, Meike; Rook, Lorenzo (January 5 1999). "Evidence of hominid-like precision grip capability in the hand of the Miocene ape Oreopithecus". PNAS 96 (1): 313–317. DOI:10.1073/pnas.96.1.313. PMC 15136. PMID 9874815. http://www.pnas.org/content/96/1/313.full.pdf.
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- Young, Richard W. (January 2003). "Evolution of the human hand: the role of throwing and clubbing". Journal of Anatomy 202 (1): 165–174. DOI:10.1046/j.1469-7580.2003.00144.x. PMC 1571064. PMID 12587931. //www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=1571064.
External links
Media related to Thumbs at Wikimedia Commons 
The Wiktionary entry for thumb
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This entry is from Wikipedia, the leading user-contributed encyclopedia. It may not have been reviewed by professional editors (see full disclaimer)
Translations:
Top
Thumb
Dansk (Danish)
n. - tommelfinger
v. tr. - fingerere ved, lave fingermærker i
v. intr. - skimme, tomle
idioms:
- all thumbs fummelfingret, have ti tommelfingre
- thumb a ride køre på tommelfingeren, blaffe
- thumb through bladre gennem
- thumbs down tommelen nedad
- thumbs up tommelen op
- under someone's thumb i nogens magt
- well thumbed bære præg af flittig gennembladring
Nederlands (Dutch)
duim, liften bij iemand onder de plak zitten
Français (French)
n. - pouce
v. tr. - feuilleter, faire de l'auto-stop
v. intr. - indiquer qch du pouce
idioms:
- all thumbs (être) très maladroit
- thumb a ride faire de l'auto-stop
- thumb through feuilleter, parcourir
- thumbs down signal, signe de (faire qch), (fig) rejet (idée), accueil peu enthousiaste (d'une nouvelle expérience)
- thumbs up approbation, signal/signe
- under someone's thumb sous la domination d'une personne
- well thumbed lu et relu (livre)
Deutsch (German)
n. - Daumen
v. - per Anhalter fahren, trampen, durchblättern, abgreifen
idioms:
- all thumbs ungeschickt
- thumb a ride per Anhalter fahren, trampen
- thumb through durchblättern
- thumbs down Ablehnung
- thumbs up Zustimmung
- under someone's thumb unter jmds. Fuchtel
- well thumbed zerlesen
Ελληνική (Greek)
n. - (ανατ.) αντίχειρας
v. - φυλλομετρώ, τσακίζω (τη σελίδα βιβλίου), (καθομ.) κάνω οτοστόπ
idioms:
- all thumbs είμαι αδέξιος
- thumb a ride κάνω οτοστόπ
- thumb through ξεφυλλίζω ή φυλλομετρώ βιβλίο
- thumbs down χειρονομία απόρριψης ή καταδίκης
- thumbs up χειρονομία έγκρισης ή απαλλαγής
- under someone's thumb υποταγμένος σε κάποιον
- well thumbed (βιβλίο) πολυξεφυλλισμένο
Italiano (Italian)
chiedere un passaggio, sfogliare, pollice
idioms:
- all thumbs goffo
- sticks/stands out like a sore thumb salta subito agli occhi, si nota
- thumb a ride fare l'autostop, farsi dare un passaggio
- thumb through sfogliare
- thumbs down disapprovazione
- thumbs up evviva!, approvazione
- under someone's thumb sotto il controllo di
Português (Portuguese)
n. - polegar (m)
v. - dedilhar, manusear
idioms:
- all thumbs desajeitado, desastrado
- sticks/stands out like a sore thumb destoar
- thumb a ride pedir carona
- thumb through folhear com o polegar
- thumbs down gesto de desaprovação
- thumbs up exclamação de satisfação, gesto de aprovação
- under someone's thumb debaixo da pressão de alguém
- well thumbed muito manuseado
Русский (Russian)
перелистывать, большой палец (руки), большой палец (перчатки), мера длинны = 1 дюйм, просить подвозить
idioms:
- all thumbs неуклюжий
- sticks/stands out like a sore thumb бросаться в глаза, колоть глаза, оскорблять взор
- thumb a ride стоять на дороге и просить у водителей подвезти куда-нибудь по пути
- thumb through перелистать книгу
- thumbs down знак неодобрения чего-л.
- thumbs up знак одобрения чего-л. "ладно! давай!"
- under someone's thumb быть всецело под чьим-то влиянием
- well thumbed замусоленный (о книге)
Español (Spanish)
n. - dedo pulgar
v. tr. - hacer autostop, hacer dedo, hojear (con el pulgar), manejar, tocar, ejecutar torpemente, manosear
v. intr. - hacer autostop, hacer dedo
idioms:
- all thumbs torpe
- thumb a ride hacer autostop, hacer dedo, pedir aventón
- thumb through hojear
- thumbs down estar en contra de, desaprobar
- thumbs up ¡buena suerte!
- under someone's thumb estar dominado por alguien
- well thumbed muy usado, bien sobado
Svenska (Swedish)
n. - tumme
v. - tumma på, använda flitigt, bläddra igenom
中文（简体）(Chinese (Simplified))
拇指, 第一指, 一拇指的宽度, 用拇指翻动, 竖起拇指要求搭便车, 笨拙地摆弄, 靠搭便车旅行, 用拇指翻书, 迅速翻阅
idioms:
- all thumbs 笨手笨脚
- thumb a ride 竖起拇指要求免费搭车, 搭便车
- thumb through 翻查
- thumbs down 反对, 责备
- thumbs up 翘拇指, 准许, 赞成
- under someone's thumb 在某人支配下
- well thumbed 经常被翻阅的
中文（繁體）(Chinese (Traditional))
n. - 拇指, 第一指, 一拇指的寬度
v. tr. - 用拇指翻動, 豎起拇指要求搭便車, 笨拙地擺弄, 靠搭便車旅行
v. intr. - 用拇指翻書, 豎起拇指要求搭便車, 迅速翻閱
idioms:
- all thumbs 笨手笨腳
- thumb a ride 豎起拇指要求免費搭車, 搭便車
- thumb through 翻查
- thumbs down 反對, 責備
- thumbs up 翹拇指, 准許, 贊成
- under someone's thumb 在某人支配下
- well thumbed 經常被翻閱的
한국어 (Korean)
n. - 엄지손가락, 마리화나 담배, 엄지 손가락
v. tr. - 엄지손가락으로 넘기다, 훑어보다, 서투르게 연주하다
v. intr. - 엄지손가락으로 책장을 넘기며 읽다, 편승을 부탁하다, 히치하이크 하다
idioms:
- thumb through 급히 훑어보다
- thumbs down 못쓰겠어, 돼먹지를 않았어!
- under someone's thumb ~의 손아귀에 쥐여서, ~이 시키는 대로
- well thumbed 훌륭한 연주
日本語 (Japanese)
n. - 親指
v. - 親指でめくる, ヒッチハイクする, 頼む, ページをめくる
idioms:
- all thumbs ぎこちない不器用な
- thumb a ride ヒッチハイクする
- thumb one's nose at あざける
- thumb through 急いで目を通す
- thumbs down 拒否の合図
- thumbs up 賛意の合図
العربيه (Arabic)
(الاسم) أبهام اليد (فعل) يقلب الصفحات بأبهامه تحت سلطه فلان أو نفوذه
עברית (Hebrew)
n. - אגודל, בוהן
v. tr. - ביקש טרמפ, קיבל הסעה
v. intr. - דיפדף באגודל, הפך דפים, ליכלך באגודל, ביקש טרמפ, קיבל הסעה
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