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Encyclopedia > Intramembranous
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Intramembranous ossification is one of two processes by which bones develop. "Mesenchymal models of bone form during the ebryonic period and begin to undergo direct ossification in the foetal period." (Moore & Agur, Essential Clinical Anatomy, 1996). It is this membranous development of bone that is called intramembranous ossification. However whilst there are differences between the 2 processes of bone development between the products being replaced, the bone histolgy itself is actually identical.


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BONE DEVELOPMENT (1411 words)
Intramembranous ossification takes place in the so-called membrane bones of the skull, while endochondral ossification is characteristic of the bones of the trunk and extremities.
Osteoblasts in this location are engaged in periosteal bone formation, a type of intramembranous ossification, which is responsible for the growth in thickness of long bones.
Remember there are bones in the body, which are formed exclusively by intramembranous ossification, but there is NO bone in the body, which is the product of endochondral ossification alone.
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