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Axial Skeleton
Ch. 7
Skull
• 22 bones• Cranial (8)– Frontal, parietal (2), temporal (2), occipital,
sphenoid, ethmoid• Facial (14)– Nasal (2), maxillae (2), zygomatic (2), mandible,
lacrimal (2), palatine (2), inferior nasal conchae (2), vomer
Cranial Bones
Facial Bones
Fontanelles
• Dense connective tissue filled space between skull bones at birth
Sutures
• Immovable joint found between skull bones• Begin to ossify between age 20-30• Sutures– Coronal – between frontal bone and 2 parietal bones– Sagittal – between two parietal bones– Lambdoid – between parietal bones and occipital
bone– Squamous – between parietal bones and temporal
bones
Sutures
Vertebral Column
• 26 vertebrae• Numbered by region– C-1, T-5, L-3, etc.
• 5 regions– Cervical (neck) – 7– Thoracic (chest) – 12– Lumbar (lower back) – 5– Sacrum – 5 fused– Coccyx – 4 fused
Vertebral Column
• Spinal curvatures – one for each region
Vertebrae
• C-1 – atlas; C-2 – axis
Rib Cage
• 1-7 are true ribs – attached to sternum• 8-12 are false ribs – not attached to sternum• 11-12 are floating ribs – not attached to
anything• Intercostal space – space between ribs
Rib Cage and Sternum
• Clavicle• Xyphoid
process• Sternum