anatomy

intramembranous ossification

flat bones, facial bones, mandible, collar bone
delevopment of ossification center
- 1st step of IO
- osteoblats secrete extracellular fluid
calcification
- 2nd step of IO
- calcium and other mineral salts are deposited and extracellular matrix hardens
formation of trabeculae
- step 3 of IO
- extracellular matrix develops into trabeculae that fuse to form spongy bone
development of periosteum
- step 4 of IO
- mesechyme at end condenses bone to develop the periosteum
endochondral ossification

all other bones
development of cartilage model
- step 1 of EO
- mesenchymal cells develop into chondroblasts which form the cartilage model
growth of cartilage model
- step 2 of EO
- growth occurs by cell division of chrodocytes
developent of primary ossification center
- step 3 of EO
- bone tissue replaced by most cartilage
development of medullary cavity
- step 4 of EO
- bone breakdown by osteoclasts forms the medullary cavity
delelopment of 2nd ostification center
- step 5 of EO
- occurs in epises of the bone
formation of articular cartilage and epiphyseal plate
- step 6 of EO
- both structures consist of hyaline cartilage

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101489

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anatomy

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test 1

Updated

2011-09-13T20:19:04Z

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