Ch. 8 Axial Skeleton Flashcards
1
Q
Axial skeleton (3)
A
- 80 bones that make up midline of the body
- support and protect the organs of the head, neck, chest, and pelvis
- provide attachment sites for the muscles that move the head, neck, and trunk
2
Q
Appendicular skeleton (2)
A
- 126 bones that make up the extremities
- attach the extremities to the trunk
3
Q
Bones of the axial skeleton (4)
A
- skull (cranium and facial bones)
- hyoid bone
- vertebral column (cervical, thoracic, and lumbar vertebrae, scrum, and coccyx)
- rib cage (sternum and ribs)
4
Q
Cranium bones
A
house and protect the brain
5
Q
Facial bones
A
attachment sites for the muscles of chewing and facial expressions
6
Q
Hyoid bone
A
- does not articulate with any other bones of the skeleton
- attachment site for the muscles of the tongue and throat
7
Q
Paranasal sinuses (4)
A
- air-filled cavities within frontal bone, sphenoid bone, ethmoid bone, and maxillary bone
- lined by mucous membrane
- connect directly with nasal cavity
- echo chambers in the production of speech
8
Q
Vertebral column (5)
A
- vertical series of bones stacked on each other
- protects the spinal cord
- serves as an attachment site for the back muscles
- superior end: articulates with occipital bone
- distal end: sacrum articulates with pelvic bones
9
Q
Cervical vertebrae (2)
A
- 7 vertebrae
- form neck region
10
Q
Atlas (C1) (3)
A
- 1st cervical vertebra
- articulates with occipital condyles of the skull
- allows up and down movement of the skull
11
Q
Axis (C2) (2)
A
- 2nd cervical vertebra
- allows left and right rotation of the atlas and skull
12
Q
Thoracic vertebrae (3)
A
- 12 vertebrae
- form chest region
- articulate with the ribs to form rib cage
13
Q
Intervertebral disc (2)
A
- composed of fibrocartilage
- shock absorber between vertebrae
14
Q
Lumbar vertebrae (2)
A
- 5 vertebrae
- form the lower back region
15
Q
Sacrum (2)
A
- 5 fused vertebrae
- articulates with pelvic bones to form pelvic girdle