Anatomy Notes

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Western University
Anatomy and Cell Biology
Anatomy and Cell Biology 3319
Peter Merrifield

Anatomy NotesNov 1011 There are 206 bones in the body The axial skeleton consists of the skull vertebral column and thoracic cage There are 126 appendicular bones 64 upper limb 62 lower limb There are 80 axial bonesskull 29 thorax 25 vertebral column 26 The skull actually has 22 bones because 6 are bones of the middle ear 3 pairsstapes incus malleus and theres also a hyoid bone Of the 22 bones 8 are cranial bones neurocranium and 14 are facial bones viscerocranium The cranial bones are parietal 2 temporal 2 frontal 1 occipital 1 sphenoid 1 ethmoid 1 These tend to be flat plates of bone with some bony landmarks They are protective armour for the brain and are connected to each other by sutures The facial bones are maxillae 2 zygomatic 2 lacrimal 2 inferior nasal concha 2 nasal 2 palatine 2 vomer 1 mandible 1 These tend to define sensory organs eyes nose ears Coronal suturelocated between frontal and two parietal bones Squamous suturelocated between parietal and temporal bones Sagittal suturelocated between both parietal bones down midline Lambdoid suturelocated between occipital and two parietal bones Sutures are points of articulation between bones where bones touch each other They are immovable tough rigid and filled in with fibrous connective tissue Very quickly after birth baby sutures close over There are also the sphenoid located at side of head and back of eye orbit and ethmoid located on medial side of eye orbit bones which contribute to floor of cranial cavity The pterion is the site of middle meningeal artery which provides blood to the meninges It is a site of weakness and a person can bleed into their cranial cavity if hit here This is where the temporal frontal parietal and sphenoid bones all come together Frontal bone contains supraorbital margins located superior to eye orbits and each has a hole called supraorbital foramennotch through which the supraorbital nerve CNV travels In midline at top of nose is the
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