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。

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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。

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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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