During endochondral ossification, the 'bony collar' is formed by osteoblasts originating from the:
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Correct answer: Perichondrium
The bony collar is the first sign of ossification in a long bone model. It forms around the diaphysis when the perichondrium becomes vascularized and transitions into the periosteum, triggering the differentiation of mesenchymal cells into osteoblasts.
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