0
Skeletal System
The skeletal system provides definite shape and mechanical support to the body, and it also helps in movement and locomotion. Ask questions about the skeletal system and bones here.
14,490 Questions
The associated bones of the skull include what?
The associated bones of the skull include the mandible (jawbone), hyoid bone, and auditory ossicles (malleus, incus, and stapes).
The layer of serous membrane that covers the heart and lies closest to the sternum is the?
It is called the pericardium.
What do the three smallest bones in your body do?
The smallest bones are the ear ossicles, three bones that are found in the middle ear. They are called the stapes ("stirrup"), incus ("anvil"), and malleus ("hammer"). The three ossicles transmit sounds from the air to the fluid-filled labyrinth (cochlea). Without these bones, you would have moderate to severe hearing loss. "Ossicles" litterally means "tiny bones."
Your funny bone ia actually a nerve named for what bone?
well the funny bone is the bone....but if you're wondering why its CALLED funny bone, then its because a part in the funny bone is called humerus and HUMERus (its like humor but misspelled)
How do calcium levels influence bone remodeling?
Calcium levels play a crucial role in bone remodeling by serving as a key component in bone mineralization. Adequate calcium levels help maintain bone density and strength, which is essential for the remodeling process. Low calcium levels can lead to decreased bone density and increase the risk of fractures due to impaired bone remodeling.
Describe bone physiology and the bone remodeling cycle?
Bone is broken down and built up all the time. This occurs on the surface of all bone types. About 10% of bone is replaced each year. Osteoblasts build bone. Osteoclasts break it down. Calcium is needed for this process.
Compare compact and spongy bone in macroscopic appearance structure and relative location?
Compact Bone in macroscopic appearance looks solid and dense.
Spongy bone in macroscopic appearance looks poorly organized.
compact bone in microscopic structure is riddled with passage ways that serve as conduits for nerves, blood vessels and lymphatic vessels.
Spongy bone is microscopic structure; the trabaculae in spongy bone align precisely along lines of stress and help the bone resist stress as much as possible.
Location of compact bone in the outer layer of short, flat and irregular bones and also in the diaphysis of long bones. Spongy bone location; in the inside of short, flat and irregular bones and also in the epihyses of long bones.
What does the skeletal framework of the neck consist of?
The neck is composed of several vertebrae that are stacked together. The vertebrae work together to protect the spinal cord from injury.
The skeletal framework of the neck consists of multiple stacked vertebrae. Sometimes an individual vertebra can pop out of place, causing pain. Chiropractic intervention can return bulging discs to their place.
The humerus articulates with what bone marking of the scapula?
marking or making?
Humerus bone makes joint with Clavicula and scapula
That is the shoulder joint
What are the four nerve plexuses?
Cervical: C1 - C5
Innervates muscles of neck and extend into thoracic cavity, where they control diaphragmatic muscles. Major nerve: Phrenic...which provides entire nerve supply to diaphragm.
Brachial: C5-T1
Innervates pectoral girdle and upper limbs. Major nerves: Radial nerve, median nerve, ulnar nerve.
Lumbar: T12 - L4
Innervates pelvic girdle and lower limbs. Major nerves: Genitofemoral nerve, lateral femoral cutaneous nerve, and femoral nerve.
Sacral: L4-S5
Innervates pelvic girdle and lower limbs. Major nerves: Sciatic nerve (which branches into tibial and fibular nerves) and pudendal nerve.
The hyoid bone is an unpaired bone in the human body. It is located in the neck and is unique because it does not directly articulate with any other bone. The hyoid bone plays a crucial role in supporting the tongue and providing attachment points for various neck muscles.
What structure in the knee prevents hyperextension?
The anterior cruciate ligament (ACL) is the primary structure in the knee that prevents hyperextension. It runs diagonally in the middle of the knee and helps stabilize the joint during activities that require sudden stops or changes in direction. Injury to the ACL can result in instability and an increased risk of hyperextension.
With what part of the hip bone does The head of the femur articulate?
The head of the femur articulates with the os coxa (pelvis) at the acetabulum. The acetabulum is the rounded socket that the head of the femur fits into. It also allows sliding of the pelvic bones and rotation. This joint is a synovial joint and is an example of a "ball-and-socket" joint.
What bone is the crista galli?
The crista galli is a bony ridge extending up from the ethmoid bone in the skull. It helps to support the olfactory bulb, which is responsible for the sense of smell.
Hemopoiesis is carried out in the?
Hemopoiesis, also known as hematopoiesis, is the process of blood cell formation. It primarily occurs in the bone marrow, specifically in the red bone marrow found in bones. Stem cells differentiate and develop into various blood cell types, such as red blood cells, white blood cells, and platelets, through hemopoiesis.
Which large laryngeal cartilage is the hyoid bone located above?
The hyoid bone is located above the thyroid cartilage, which is the largest laryngeal cartilage in the human body. The hyoid bone sits in the neck at the base of the tongue and does not articulate with any other bones.
No, short, irregular, and flat bones have large marrow cavities for the production of blood cells, not to keep their weight light. These bones have a spongy structure that provides strength while being relatively lightweight.
How can alcohol affect the skeletal system?
Excessive alcohol consumption can weaken bones and increase the risk of osteoporosis by interfering with the body's ability to absorb calcium and other important minerals. Chronic alcohol abuse can also impair bone formation and repair, leading to brittle bones and an increased risk of fractures.
What is the name for the bone forming cells?
There are 206 bones in the adult body.
Axial Skeletal Bones:
Cranial Bones: Ethmoid bone, Frontal Bone, Occipital bone, Parietal bones, Sphenoid bone, & Temporal bones
Facial Bones: Inferior Nasal Conchae, Lacrimal bones, Mandible, Maxillae (Maxilla singular), Nasal bones, Palatine bones, Vomer, Zygomatic bones, & Hyoid bone
Vertebral Column: 7 Cervical, 12 Thoracic, 5 Lumbar, 5 (fused) Sacral, & 4 (fused) Coccygeal vertebrae
Thoracic Region: 24 Ribs & Sternum
Appendicular Skeletal Bones:
In the Arms and Hands: Clavicles, Scapulae (Scapula singular), Humeri (Humerus singular), Radii (Radius singular), Ulnae (Ulna singular), 8 Carpals (Scaphoid, Lunate, Triquetral, Pisiform, Trapezium, Trapezoid, Capitate, and Hamate) in each wrist, 5 Metacarpals in each hand, & 14 Phalanges in each hand
In the Legs and Feet: Illium, Ischium, & Pubis (Illium, Ischium, and Pubis are fused together in adults and called the Os Coxae), Femurs, Patellae (Patella singular), Tibiae (Tibia singular), Fibulae (Fibula singular), 7 Tarsals (Tarsus singular - Talus, Calcaneus, Navicular bone, Cuboid bone, 1st, 2nd, and 3rd, Cuneiform bones) in each ankle, 5 Metatarsals in each foot, & 14 Phalanges (Phalanx singular) in each foot
cranium (skull) mandible (jaw) clavicle (collar bone) scapula (shoulder blade) humerus (upper arm bone) ulna and radius (lower arm bones) carpals (top bones of the wrist) meta carpals (lower bones of the wrist) phalanges (fingers and thumb) sternum (breast bone) ribs (ribs) vertebrae, lumbar (lower), thoracic (middle), and cervicle (upper) - spine and
# # # # # # # # # # # # # # # # # # # # # # == #
- the Cranial bones:
- frontal bone
- parietal bone (2)
- temporal bone (2)
- occipital bone
- sphenoid bone
- ethmoid bone
- Facial bones:
- mandible
- maxilla (2)
- palatine bone (2)
- zygomatic bone (2)
- nasal bone (2)
- lacrimal bone (2)
- vomer bone
- inferior nasal conchae (2)
In the middle ears (6):
- malleus (2)
- incus (2)
- stapes (2)
In the throat (1):
- hyoid bone
In the shoulder girdle (4):
- scapula or shoulder blade (2)
- clavicle or collarbone (2)
In the thorax (25 or 27):
- sternum
- Can be considered as three different bones; manubrium, body of sternum (gladiolus) and xiphoid process
- ribs (2 x 12)
In the vertebral column (24):
- cervical vertebrae (7)
- thoracic vertebrae (12)
- lumbar vertebrae (5)
In the arms (2):
- humerus (2)
In the forearms (4):
- radius (2)
- ulna (2)
In the hands (54):
- Carpal (wrist) bones:
- scaphoid bone (2)
- lunate bone (2)
- triquetral bone (2)
- pisiform bone (2)
- trapezium (2)
- trapezoid bone (2)
- capitate bone (2)
- hamate bone (2)
- Metacarpus (palm) bones:
- metacarpal bones (5 × 2)
- Digits of the hands (finger bones or phalanges):
- proximal phalanges (5 × 2)
- intermediate phalanges (4 × 2)
- distal phalanges (5 × 2)
In the pelvis (4):
- coccyx (4 or 5 fused)
- sacrum (5 fused)
- hip bone (innominate bone or coxal bone) (2)
In the thighs (2):
- femur (2)
In the legs (6):
- patella (2)
- tibia (2)
- fibula (2)
In the feet (52):
- Tarsal (ankle) bones:
- calcaneus (heel bone) (2)
- talus (2)
- navicular bone (2)
- medial cuneiform bone (2)
- intermediate cuneiform bone (2)
- lateral cuneiform bone (2)
- cuboid bone (2)
- Metatarsus bones:
- metatarsal bone (5 × 2)
- Digits of the feet (toe bones or phalanges):
- proximal phalanges (5 × 2)
- intermediate phalanges (4 × 2)
- distal phalanges (5 × 2)
THE BONES IN OUR SKELETAL BODY ARE:
Cranium, Maxilla, Mandible, Parietal Lobe, Occipital Lobe, Frontal Lobe, Nasal, Temporal Lobe, (HEAD)
Clavicle, Scapula, Sternum, True Ribs, False Ribs, Floating Ribs, Vertebrae, Cervical, Thoracic, Lumbar, Sacral/Sacrum, Coccyx/Cotyl (CHEST)
Humerus, Radius, Ulna, Carpals, Metacarpals, Phalanges (ARM)
Femur, Patella, Tibia, Fibula, Tarsals, Metatarsals, Phalanges (LEG)
A typical adult human skeleton consists of the following 206 bones.
In the skull (22):
- Cranial bones:
- 1. frontal bone
- 2. parietal bone (2)
- 3. temporal bone (2)
- 4. occipital bone
- sphenoid bone
- ethmoid bone
- Facial bones:
- 5. zygomatic bone (2)
- 6. superior and 7. inferior maxilla
- 9. nasal bone (2)
- mandible
- palatine bone (2)
- lacrimal bone (2)
- vomer bone
- inferior nasal conchae (2)
In the middle ears (6):
- malleus (2)
- incus (2)
- stapes (2)
In the throat (1):
- hyoid bone
In the shoulder girdle (4):
- 25. clavicle or collarbone (2)
- 29. scapula or shoulder blade (2)
In the thorax (25):
- 10. sternum
- ribs (2 x 12)
In the vertebral column (24):
- 8. cervical vertebrae (7) incl. atlas & axis
- 14. lumbar vertebrae (5)
- 28. thoracic vertebrae (12)
In the arms (6):
- 11. humerus (2)
- 26. condyles of humerus
- 12. ulna (2)
- 13. radius (2)
- 27. head of radius
In the hands (54):
- Wrist (carpal) bones:
- scaphoid bone (2)
- navicular bone (2)
- lunate bone (2)
- triquetral bone (2)
- pisiform bone (2)
- Trapezium (bone) (2)
- trapezoid bone (2)
- capitate bone (2)
- hamate bone (2)
- Palm or metacarpal bones:
- metacarpal bones (5 × 2)
- Finger bones or phalanges:
- proximal phalanges (5 × 2)
- intermediate phalanges (4 × 2)
- distal phalanges (5 × 2)
In the pelvis (4):
- 15. ossa coxae (hip bones or innominate bones) (2)
- 16. sacrum
- coccyx
In the legs (8):
- 17. head and 18. shaft of femur (2)
- 22. greater trochanter of femur
- 23. condyles of femur
- 19. patella (2)
- 20. shaft and 24. tuberosity of tibia (2)
- 21. fibula (2)
In the feet (52):
- Ankle (tarsal) bones:
- calcaneus (heel bone) (2)
- talus (2)
- navicular bone (2)
- medial cuneiform bone (2)
- intermediate cuneiform bone (2)
- lateral cuneiform bone (2)
- cuboid bone (2)
- Instep bones:
- metatarsal bone (5 × 2)
- Toe bones:
- proximal phalanges (5 × 2)
- intermediate phalanges (4 × 2)
- distal phalanges (5 × 2)
Cranial bones:
frontal bone
parietal bone
temporal bone
occipital bone
sphenoid bone
ethmoid bone
Facial bones:
mandible
maxilla
palatine bone
zygomatic bone
nasal bone
lacrimal bone
vomer bone
inferior nasal conchae
In the middle ears
malleus
incus
stapes
In the throat
hyoid bone
In the shoulder girdle
scapula or shoulder blade
clavicle or collarbone
In the thorax
sternum
Can be considered as three bones; manubrium, body of sternum (gladiolus) and xiphoid process
ribs
In the vertebral column
cervical vertebrae
thoracic vertebrae
lumbar vertebrae
In the arms
humerus
In the forearms
radius
ulna
In the hands :
Carpal (wrist) bones:
scaphoid bone
lunate bone
triquetral bone
pisiform bone
trapezium
trapezoid bone
capitate bone
hamate bone
Metacarpus (palm) bones:
metacarpal bones
Digits of the hand (finger bones or phalanges):
proximal phalanges
intermediate phalanges
distal phalanges
In the pelvis
coccyx
sacrum
hip bone (innominate bone or coxal bone)
In the thighs
femur
In the legs
patella
tibia
fibula
In the feet
Tarsal (ankle) bones:
calcaneus (heel bone)
talus
navicular bone
medial cuneiform bone
intermediate cuneiform bone
lateral cuneiform bone
cuboid bone
Metatarsus bones:
metatarsal bone
Digits of the foot (toe bones or phalanges):
proximal phalanges
intermediate phalanges
distal phalanges
Where do you think, Practically everywhere!! Maybe more then 250 so yeah answers your question.
How long does the average bone cell live?
The average lifespan of a bone cell is around 25-30 years. However, some bone cells can live much longer, and others are constantly being renewed through a process called bone remodeling.
If osteoclasts are more active than osteoblasts?
If osteoclasts are more active than osteoblasts, there is a net decrease in bone density as osteoclasts break down bone tissue faster than osteoblasts can form new bone. This can lead to conditions like osteoporosis where bone becomes weak and brittle. It is important to maintain a balance between osteoclast and osteoblast activity for healthy bone remodeling.
What forms inferior portion of nasal septum in back?
The inferior portion of the nasal septum in the back is formed by the perpendicular plate of the ethmoid bone and the vomer bone. These bones help to separate the left and right nasal cavities and contribute to the structure of the nasal septum.
What type of joint is formed between the femur and coxal bone?
The type of joint formed between the femur and coxal bone is a ball-and-socket joint, specifically known as the hip joint. This type of joint allows for a wide range of motion in multiple directions.
The lumbar puncture must be done below the?
The lumbar puncture must be done below the level of the spinal cord termination (conus medullaris), which is typically at the L1-L2 vertebral level in adults. Placing the needle below this point reduces the risk of spinal cord injury.
