Spongy bone - membrane bone forms from fibrous membrane o...

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Spongy bone: trabeculae... a few cell layers of irregularly arranged lamellae & osteocytes connected by canaliculi - no osteons; nutrients delivered by capillaries in endosteum Chemical composition of bone: - organic component: cells (osteocytes, osteoblasts & osteoclasts) & osteoid (organic matrix... ground substance & collagen fibers) - inorganic component: hydroxyapatites (mineral salts); mostly calcium phosphates - calcium salt crystals pack around collagen fibers in matrix Bone markings: - outward projections: heads, trochanters, spines,... - depressions & grooves - see table 6-1 Bone development: - osteogenesis (ossification) ... in infants & adolescents for skeleton formation & growth; in adults for bone remodeling - Intramembranous ossification:
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Unformatted text preview: membrane bone forms from fibrous membrane o Ossification center appears in fibrous connective tissue membrane o Bone matrix (osteoid) is secreted within membrane o Woven bone (trabeculae) & periosteum form o Bone collar of compact bone forms & red marrow develops- Endochondral ossification: bone forms by replacing hyaline cartilage (at primary ossification center) o Bone collar forms around diaphysis of cartilage o Central cartilage calcifies & cavitates o Periosteal bud enters internal cavity & spongy bone forms o Diaphysis elongates & medullary cavity forms o Ossification of epiphyses at secondary ossification centers- Following secondary ossification, hyaline cartilage remains only: o On epiphyseal surfaces (joints)...
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