The clavicle, mandible, and facial and cranial flat bones develop directly in vascularized mesenchyme through a process called
A) endochondral ossification.
B) mesodermal outgrowth.
C) differentiating chondroblasts.
D) intramembranous ossification.

Question

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The clavicle, mandible, and facial and cranial flat bones develop directly in vascularized mesenchyme through a process called intramembranous ossification. Intramembranous ossification begins near the end of the second month of gestation. The remaining bones of the body develop through endochondral ossification, or the deposition of bone on a cartilaginous model.

The Clavicle, Mandible, and Facial and Cranial Flat Bones Develop