They can also arise in endochondral bone; or primitive mesenchymal cells in the brain, meninges, membranous bone, or soft tissue.
它们可以起源于软骨内骨、或者脑内的间充质细胞、脑膜、膜内成骨或者软组织。
Autografts on the other hand heal by endochondral ossification at these interfaces, and by membranous bone formation along the graft surface.
别一方面，自体骨移植是通过连接段的软骨内骨化和移植表面的骨膜成骨愈合。
A bone that forms directly in membranous connective tissue, as some cranial bones, instead of developing from cartilage.
不经过软骨雏型，而直接从膜状结缔组织骨化为骨的一种骨，如一些头胪骨。
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