Class notes
tissues
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structure of tissues cartilage, bone
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Microscopic View of Spongy Tissuestrabeculae run in all directions endure stress and only a few cell layers thick
trabecular containirregularlyarrangedlamellae and osteocytesconnectedbycanalul
no osteons usesdiffusion
intra
membraneous
bonedevelopsfromfibrousCTmembraneswithmesenchymalcells
jjjime
beginsat 8weeks ofembryonicdevelopmentcranialbones and clavicle
endochondral
ofhyalinecartilage for all bonesbelow skull more complex
starts at 2nd month of development
2nd ossification
hyaline cartliedgeremainsonly onepiphyses
Mechanismsof Growth
longboneslengthen entirelythroughinterstitial
growth ofepiphysealplates
allbonesgr w in thicknessthroughappositional
growth
bonesstopgrowingin adolescenceearly adulthood except for somefacialbonesnosejaw
boneisdestroyed byosteoclastand laid down by
osteoblasts
epiphysealplateremainsthe same size throught
childhoodandgetsthinner in adulthood
appositionalgrowth
osteoblasts secretebonematrix atperiosteum
osteocytesdestroybonematrix atendo
steal
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