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 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 are floating ribs – not attached to anything Intercostal space – space between ribs

Rib Cage and Sternum Clavicle Xyphoid process Sternum