The cylindrical space within the diaphysis of a long bone is called the medullary cavity. This hollow central space contains bone marrow, which is red in children and mostly replaced by yellow (fat) marrow in adults.
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The cylindrical space within the diaphysis of a long bone is called the medullary cavity. This hollow central space contains bone marrow, which is red in children and mostly replaced by yellow (fat) marrow in adults.
