Details Title: 231 Description: Bones Total Flash Cards: 13 Created: 11/05/2008 13:04:21		New Users: To study from this flashcard set, or to create your own your own study flash cards, REGISTER HERE. Existing Users: CLICK HERE. Additional Biology Flashcards
Cards in this set: Term Bones: Classifications (5) Definition Long Bones: long w/. extended ends   Short: Cubelike (wrist)   Flat: Platelike; skull bones    Irregular: Various shapes; vertebrae   Sesamoid: Round; kneecap      Term Long Bone Components : Epiphysis     Definition Epiphysis: Expanded end of bone; often conevered w/ hyaline cartilage     Term Long Bone Components: Diaphysis Definition Diaphysis: main shaft of bone     Term Long Bone Components: Periosteum Definition Periosteum: Out covering of bone; fibrous tissue; vascular.   Functions in tendon attachment and bone formation/repair (deposition and reabsorption)        Term Long Bone Components: Processes Definition Processes: sites of attachment, blood vessle routing, or articulation areas. Term Long Bone Components: Compact Bone Definition Also called cortical bone; continuous ECM (no gaps); lines diaphysis within periosteum. Term Long Bone Components: Spongy Bone Definition Also called 'cancellous' bone; found in epiphysis   Consists of branching plates of bone called trabeculae. Structure reduces weight.  Term Long Bone Components: Medullary cavity Definition Hollow chamber w/in diaphysis   Spongy interior lined w// endosteum, filled w/ marrow, soft connective tissue.  Term Long Bone Components: Osteocytes Definition Found in tiny lacunae chambers, which form concentrically around Haversian Canals. Term Long Bone Components (Microscopic): Osteons Definition Fundamental units of compact bone, also known as Haversion system. Concentric units oreinted with direction of diaphysis around Haversian canals - which supply blood vessles and nerves.   Osteocytes w/in osteons connected to eachother's cytoplasm through canaliculi.   Osteons resist compressional forces.    Term Wolff's Law Definition "Bones remodel according to forces" Term Misc. info Definition Collages gives bones strength and resillance; mineral slats provide hardness. Term Bone Composition   Matrix   Aging Changes   Embryonic Structure Definition Bone matrix around osteocytes composed of collagen and inorganic minerals: Calcium Phosphate and Calcium Carbonate.   Calcium Phospahte is bulk of bone mineral.   Aging: Collagen/mineral ratio changes as we get older; bones lose collagen and become more rigid.   Embryonic tissue is connective-tissue sheets called mesenchyme.