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What is the hollow space within the diaphysis of a long bone called?

User Smallo
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Answer:

The hollow region in the diaphysis is called the medullary cavity, which is filled with yellow marrow. The walls of the diaphysis are composed of dense and hard compact bone. ... The outer surface of the bone is covered with a fibrous membrane called the periosteum(peri- = “around” or “surrounding”).

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User John Ding
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