axial skeleton
DESCRIPTION
Axial Skeleton. Ch. 7. Two types of bone markings. Depressions – cavities that indent the bone Projections – processes that grow out of the bone Add - fontanelles. Fontanelles. Dense connective tissue filled space between skull bones at birth. Fissure. - PowerPoint PPT PresentationTRANSCRIPT
Axial Skeleton
Ch. 7
Two types of bone markings
• Depressions – cavities that indent the bone• Projections – processes that grow out of
the bone
• Add - fontanelles
Fontanelles
• Dense connective tissue filled space between skull bones at birth
Fissure
• Narrow, slit-like opening between adjacent parts of a bone, through which vessels and nerves pass
Foramen
• An opening through which blood vessels, nerves, or ligaments pass
Fossa
• Depression in or on a bone
Groove or sulcus
• Furrow or depression that accommodates a soft structure such as a blood vessel, nerve, or tendon
Condyle
• Large, rounded articular prominence
Facet
• A smooth, flat surface
Head
• Rounded articular projection supported on the neck of a bone
Tuberosity
• Large, rounded, usually roughened process
Trochanter
• Large projection found only on the femur
Skull
• 22 bones• Cranial (8)– Frontal, parietal, temporal, occipital, sphenoid,
ethmoid• Facial (14)– Nasal, maxillae, zygomatic, mandible, lacrimal,
palatine, inferior nasal conchae, vomer
Skull
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 – no 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