2B Skeleton - Biol 255 Unit 2B Biology 255 Unit 2B The...

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Biol 255 Unit 2B B. Krumhardt, Ph.D., GDCB, ISU 1 Biology 255 Unit 2B – The Skeleton B. Krumhardt, Ph.D. GDCB, Iowa State University Axial Skeleton • Eighty bones in three regions – Skull – Vertebral column – Bony thorax Appendicular Skeleton • Bones of arms, legs, and shoulder and pelvic girdles Axial Skeleton Skull
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Biol 255 Unit 2B B. Krumhardt, Ph.D., GDCB, ISU 2 Skull • Formed by the cranium and facial bones – most complex bony structure of body • Cranium – protects the brain and is the site of attachment for head and neck muscles – Paired bones– parietal and temporal – Unpaired bones – frontal, occipital, sphenoid, and ethmoid • Facial bones – Provides framework for face, sense organs, and teeth – Provide openings for passage of air and food – Anchors facial muscles of expression • Foramen magnum of occipital bone – spinal cord ascends to brain within skull • Carotid canals and jugular foramina – allow for passage of internal carotid arteries and internal jugular veins – Supply blood to brain and drain it away – Near ears – can hear pulse if excited • Cribriform plate of the ethmoid – allow passage of olfactory nerves – Crista galli – attaches to the dura mater of the brain’s meninges, holding brain in place
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Biol 255 Unit 2B B. Krumhardt, Ph.D., GDCB, ISU 3 • Sella turcica of the sphenoid – Hypophyseal fossa encloses pituitary gland • Orbits – Bony cavities - eyes encased and cushioned by fatty tissue – Formed by frontal, sphenoid, zygomatic, maxilla, palatine, lacrimal, and ethmoid – Optic canals of the sphenoid – allows passage of optic nerves from eyes; some nerve fibers cross in the chiasmic groove connecting them • Nasal cavity – Bone and hyaline cartilage – Formed by ethmoid, spenoid, vomer, maxilla, lacrimal, and palatine bones and septal cartilage – Covered by mucosa - mucus traps particles – Concha swirl air - inspired air acquires moisture and warmth • Sinuses – mucosa-lined and air-filled
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This note was uploaded on 10/14/2011 for the course BIOL 255 taught by Professor Staff during the Fall '08 term at Iowa State.

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2B Skeleton - Biol 255 Unit 2B Biology 255 Unit 2B The...

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