what is the tissue that lines the medullary cavity
Also found in: Dictionary, Thesaurus, Encyclopedia, Wikipedia. endosteum. the tissue lining the medullary cavity of a bone. enÂ·dosÂ·teÂ·um. A layer of cells lining the inner surface of bone in the central medullary cavity. endosteum. /enÂ·dosÂ·teÂ·um/ (en-dosÂ´te-um) the tissue lining the medullary cavity of a bone. endosteum. n. pl. The thin layer of cells lining the medullary cavity of a bone.