Biol129_C6 - 1 The Skeletal System Background The skeletal...

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Unformatted text preview: 1 The Skeletal System Background The skeletal system is composed of: Bones & Cartilage Bones provide: Support Framework of levers for motion Organ protection Storage of minerals Ca +2 and PO 4-3 2 Cartilage Flexible, semirigid CT Appears where flexibility required Ex: Costal cartilage Ribs->Sternum Appears on articulating surfaces Provides smooth friction-free surface A precursor to bone, calcification Newborns & kids are much more flexible than adults Cartilage - 2 Cartilage is dense; vessels do not penetrate it so Cartilage is avascular ! Nutrients and O 2 must diffuse into tissue Surrounded by perichondrium Exceedingly slow to heal, if at all Also, good site for infection 3 Bone Bone is a living tissue, as we learned As such it needs nutrients These are delivered normally There are two basic types of bone tissue Compact Dense, regular composition, strong The outer layer of bones Spongy Open lattice of bone inside most bones Lightens bones, provides space. Compact Bone Tissue Periosteum Bone covering Is vascular and innervated Units are Osteons A central canal with vessels and nerves The Haversian canal A collagenous sheath Concentric lamellae of matrix material 4...
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Biol129_C6 - 1 The Skeletal System Background The skeletal...

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