metatarsus

Bone: Metatarsal
Skeleton of foot. Lateral aspect.
Latin	metatarsus ossa metatarsalia
Gray's	subject #64 272
MeSH	Metatarsus

The metatarsus or metatarsal bones are a group of five long bones in the foot located between the tarsal bones of the hind- and mid-foot and the phalanges of the toes. Lacking individual names, the metatarsal bones are numbered from the medial side (side of big toe): the first, second, third, fourth, and fifth metatarsal. The metatarsals are analogous to the metacarpal bones of the hand.

Common characteristics

The five metatarsals are dorsally convex long bones consisting of a shaft or body, a base, and a head. ^[1] Body is prismoid in form, tapers gradually from the tarsal to the phalangeal extremity, and is curved longitudinally, so as to be concave below, slightly convex above. The base or posterior extremity is wedge-shaped, articulating proximally with the tarsal bones, and by its sides with the contiguous metatarsal bones: its dorsal and plantar surfaces are rough for the attachment of ligaments. The head or anterior extremity presents a convex articular surface, oblong from above downward, and extending farther backward below than above. Its sides are flattened, and on each is a depression, surmounted by a tubercle, for ligamentous attachment. Its plantar surface is grooved antero-posteriorly for the passage of the flexor tendons, and marked on either side by an articular eminence continuous with the terminal articular surface. ^[2]

Articulations

Bones of the right foot. Dorsal surface.

The base of each metatarsal bone articulates with one or more of the tarsal bones at the tarsometatarsal joints, and the head with one of the first row of phalanges at the metatarsophalangeal joints. Their bases also articulates with each others at the intermetatarsal joints

• The first metatarsal articulates with the medial cuneiform, and to a small extent to the intermediate cuneiform.^[3]
• the second with all three cuneiforms.^[3]
• the third with the lateral cuneiform.^[3]
• the fourth with the lateral cuneiform and the cuboid.^[3]
• The fifth with the cuboid.^[3]

Injuries

The metatarsal bones are often broken by football players. These and other recent cases have been attributed to the modern lightweight design of football boots, which give less protection to the foot.

Stress fractures are thought to account for 16% of injuries related to sports preparation, and the metatarsals are most often involved. These fractures are commonly called march fractures, as they were commonly diagnosed among military recruits after long marches. The second and third metatarsals are fixed while walking, thus these metatarsals are common sites of injury. The fifth metatarsal may be fractured if the foot is oversupinated during locomotion.^[4]

Additional images

CT 3D human Foot Skin and Bone	Lower extremity	X-ray of foot.	Skeleton of foot. Medial aspect.
Oblique section of left intertarsal and tarsometatarsal articulations, showing the synovial cavities.

See also

• Arches of the foot
• Bone terminology
• Terms for anatomical location

Notes

References

• Platzer, Werner (2004). Color Atlas of Human Anatomy, Vol. 1: Locomotor System (5th ed.). Thieme. ISBN 3-13-533305-1. 
• Gray, Henry (1918). "6d. 2. The Metatarsus". Anatomy of the Human Body. Bartleby.com. http://www.bartleby.com/107/64.html. 

External links

• SUNY Figs 16:01-05