1106Topic3B - ANP 1106: Topic 3B Anatomy of the Skeletal...

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ANP 1106: Topic 3B Anatomy of the Skeletal System
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THE SKELETON (Chapter 7) 206 bones in human skeleton - make up about 20% of body weight grouped into axial and appendicular skeletons axial skeleton = bones of skull, vertebral column, rib cage » appendicular skeleton = bones of upper & lower limbs + pectoral/pelvic girdles (attach limbs to axial skeleton) AXIAL SKELETON 80 bones SKULL most complex 2 sets of bones: cranial + facial = 22 bones most skull bones are flat bones; (except mandible);united by sutures facial bones form anterior part of skull & cranial bones form the rest skull has eye orbits & paranasal sinuses, houses organs of hearing, has 85 openings for nerves, blood vessels & spinal cord
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Fig 7.1
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A) Cranium: cranium can be divided into a vault & a base vault : forms superior, lateral & posterior aspects of the skull + forehead base : inferior aspect of skull cranium surrounds & protects brain & organs of hearing & balance internally, 3 bony ridges divide the cranial base into 3 distinct areas: anterior (highest) fossa, middle fossa & posterior (lowest) fossa
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B) Facial bones or Face: form framework of the face contain the cavities for the sensory organs of sight, smell & taste provide openings for passage of air & food secure the teeth anchor the facial muscles that we use to show our feelings Fig. 7.4a
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Cranium : 8 cranial bones are the paired parietal & temporal bones & the unpaired frontal , occipital , sphenoid & ethmoid bones curvature allows them to be self-bracing; can be strong while being quite thin Fig. 7.5a
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(i) Frontal Bone: dome-shaped bone; also forms the roof of the orbits & anterior cranial fossa articulates with paired parietal bones posteriorly note supraorbital margin, supraorbital foramen, and glabella area lateral to glabella has left & right frontal sinus within bone Fig. 7.4a
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This note was uploaded on 02/08/2012 for the course ANP 1105 taught by Professor Carnegie during the Fall '08 term at University of Ottawa.

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1106Topic3B - ANP 1106: Topic 3B Anatomy of the Skeletal...

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