The manubrium and body of the sternum are converted into bone first, with the xiphoid process remaining as cartilage until late in life. View this video to review the two processes that give rise to the bones of the skull and body. What are the two mechanisms by which the bones of the body are formed and which bones are formed by each mechanism. Craniosynostosis The premature closure (fusion) of a suture line is a condition called craniosynostosis.
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