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Download CHAPTER 7 AXIAL SKELETON
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AXIAL SKELETON Skeletal System Bones axial skeleton skull , vertebral column , sacrum, thoracic cage appendicular skeleton upper extremities , shoulder girdle lower extremities , pelvic girdle Cartilage joints , discs growth plates Joints Fibrous connective tissue ligaments periosteum bumps for muscle attachments tubercle tuberosity trochanter epicondyle spine bumps forming joints head facet condyle = bone markings – bumps process holes and dips in bones indentations: fissure groove sulcus fossa holes foramen foramina canal meatus Skull functions: protect the brain protect sensory organs allow passage of nerves and blood vessels attach muscles skull = cranium + facial bones cranium cranial vault = calvarium cranial floor facial bones cranial bones frontal parietal temporal occipital sphenoid ethmoid facial bones mandible maxilla zygomatic nasal lacrimal vomer palatine inferior nasal conchae temporal bone temporal squama zygomatic process of the temporal bone mastoid process styloid process external acoustic meatus stylomastoid foramen petrous portion mandibular fossa internal acoustic meatus carotid canal occipital bone most of the floor, posterior wall of cranial cavity occipital condyles joint with vertebral column foramen magnum passage for spinal cord basilar portion (clivus) hypoglossal canal external occipital protuberance superior , inferior nuchal lines sphenoid bone unites cranial and facial bones articulates with every other cranial bone greater wing ; lesser wing pterygoid processes medial, lateral pterygoid plates sella turcica dorsum sellae ; tuberculum sellae hypophyseal fossa optic canal superior orbital fissure foramen ovale foramen spinosum foramen rotundum ethmoid bone lateral mass orbital plate medial wall of orbit seen in nasal cavity: perpendicular plate superior nasal concha middle nasal concha seen in cranial cavity : cribriform plate olfactory foramina (cribriform foramina) crista galli mandible body ramus angle mandibular condyle (condylar process) coronoid process mental foramen mandibular foramen sutures sagittal coronal lambdoid squamous occipitomastoid betw parietal bones parietal – frontal bones parietal – occipital bones parietal – temporal bones occiput - temporal orbit frontal bone zygomatic maxilla ethmoid sphenoid lacrimal zygomatic arch nasal septum hard palate temporal fossa compound structures zygomatic bone + zygomatic process of temporal perpendicular plate of ethmoid + vomer palatine bone + palatine process of maxilla holes in front orbit optic canal superior orbital fissure inferior orbital fissure facial supraorbital foramen infraorbital foramen mental foramen above: olfactory foramina sphenoid sphenoid several bones frontal maxilla mandible cribriform plate optic nerve foramen magnum carotid canal jugular foramen stylomastoid foramen foramen ovale foramen spinosum hypoglossal canal foramen rotundum foramen lacerum incisive fossa occipital temporal temporal temporal sphenoid sphenoid occipital sphenoid holes down under spinal cord int carotid artery int. jugular vein maxilla sinuses paranasal sinuses connect to nasal cavity make skull lighter frontal ethmoid maxillary sphenoid mastoid sinus no connection to nasal functions of vertebral column support body weight and head protect spinal cord allow passage for spinal nerves movement – joints movement – attach muscles vertebral terms vertebra vertebral column spinal column spine 1 bone all 24 vertebra = vertebral column = vertebral column spinal cord nervous system extension from brain C1-7 ; T1-12 ; L1-5 naming vertebra vertebral body vertebral foramen = vertebral canal protects spinal cord vertebral arch lamina pedicle processes spinous process SP transverse process TP articular processes = facets vertebral column 24 vertebra intervertebral disc “cushion” between vertebrae intervertebral foramen lateral hole for spinal nerves between vertebra Cervical vertebra C1 – C7 small vertebral body bifid SP transverse foramen atlas axis vertebral prominens hole in transverse process vertebral artery and vein C1 C2 C7 atlas C1 no vertebral body lateral mass anterior and posterior arch and tubercles forms joint with occipital condyles vertebral canal aligns with foramen magnum axis C2 dens = odontoid process atlas rotates around dens thoracic vertebra T1 – T12 attach ribs attach muscles support and move spine long SP - angled down lumbar vertebra L1 – L5 thick vertebral body + straight SP support most body weight attach muscles of support and movement sacrum and coccyx sacrum fused S1 – S5 sacral base sacral promontory ala sacral foramina sacral crest sacral canal sacral hiatus coccyx lordosis kyphosis anterior curve posterior curve scoliosis lateral curvature vertebral curves cervical , lumbar thoracic, sacrum thoracic cage sternum body manubrium jugular notch ( = sternal notch) sternal angle xiphoid process ribs functions: protect heart and lungs aid in respiration attach upper extremity muscles for trunk, UE, and neck ribs 7 true ribs 3 false ribs 2 floating ribs costal cartilage rib head rib neck rib tubercle attach to sternum attach to rib 7 don’t attach anteriorly ribs are cartilage anteriorly attaches to vertebral body attaches to transverse process
