Tim Taylor is a senior writer at Innerbody Research focusing on human anatomy and physiology. Tim earned both his Bachelor of Science degree in Biology and his Master's degree in Teaching from the University of Pittsburgh.

Last updated: Jul 10th, 2025

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The medullary cavity is a cylinder at the center of compact bone. It surrounds and protects the spongy bone marrow, which contains a material, much like gelatin. It is the central cavity of bone shafts. It is where yellow bone marrow (or adipose) is produced and stored.

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