Axial Skeleton Flashcards
Axial skeleton divided into 3 parts:
Skull, vertebral column, bony thorax
Two sets of bones form the skull
- Cranium bones enclose the brain
- Facial bones
• Hold eyes in anterior position
• Allow facial muscles to express feelings
Facial bones
8 cranial bones protect the brain
.1. frontal bone
2. Occipital bone
3. Ethmoid bone
4. Sphenoid bone
5 & 6. Parietal bones (pair)
7, 8 . Temporal bones (pair)
14 facial bones
1, 2 maxillae (pair)
3,4 palatine bones(pair)
5,6 lacrimal bones (pair)
7,8 zygomatic bones (pair)
9, 10 Nasal bones (pair)
11 Vomer bone
12, 13 Inferior nasal conchae (pair)
14 Mandible
• hollow portions of bones sorrounding the nasal cavity
• functions of paranasal sinuses
Paranasal sinuses
• closely related to mandible and temporal bones
• the only bone that does not articulate with another bone
• serves as a movable base for the tongue
• aids in swallowing and speech
Hyoid bone
provides axial support
Vertebral column
Are separated by intervertebral discs
26 vertebral bones
How many cervic vertebrae are in the neck
7
How many thoracic vertebrae are in the chest region
12
How many lumbar vertebrae are associated with the lower back
5
Formed by fusion of 5 vertebrae
Sacrum
Formed by fusion of 3-5 vertebrae
Coccyx
• spinal curvatures of the thoracic and sacral regions
• present from birth
• form a C -shaped curvature in newborna
Primary curvatures
