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img089 - BONE Page 4 of 6.4...

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Unformatted text preview: BONE Page 4 of 6 .4 Trabeculae "”J°h«rc43$” V maimed: _ Endosteum Cows menu“, Marrow uUCCiPyZLI [info 1.: {NA 5".” ALAS €( *4.ngch Bone Development _ Bone forms at about the 2nd - 3rd month in embryo; continues till about 20-25 yrs. _ Two methods of bone Development: El Intramembranous — from membranes [3 Endochondral — from cartilage Intramembranous Ossification _ Usually involves DflatD type bones j Exampleszfl ribs, skull, sternum E Bone forming cells (osteoblasts, osteoprogenitor cells) deposited in the mesenchyme (con. tis.) in a sheet-like manner - then become osteocytes in layers or laminae Growth is outward, a periosteum forms, middle becomes spongy bone between two plates of compact bone Endochondral Ossification 4 Most bones of skeleton this way ‘ Long bones are best examples _ Develops first as a mass of hyaline cart. & is later turned into bone tissue E lst spot to grow - Primary Ossification Cen., in the diaphysis, grows away from P.O.C. E Next, Secondary Ossification Cen. Form in the epiphyses E Small band of hyaline cartilage develops between diaphysis and epiphysis on both ends 3 This is the Epiphyseal Plate or Line (also called the growth plate) :1 Bone growth occurs on both sides of this plate, grows lengthwise 1 Epiphyseal Plate ossifies in early adulthood https://elearning.coursesufl.edu/webct/ContentPageServerServlet/BONEZ.htm?pageID=7... 9/1 3/2007 ...
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