Endosteum

[en'dɒstiәm]

(noun.) vascular membrane that lines the inner surface of long bones.

Edited by Cary--From WordNet

(n.) The layer of vascular connective tissue lining the medullary cavities of bone.

Typist: Weldon

n. (anat.) the internal periosteum.—adj. Endos′tēal.—n. Endostī′tis inflammation of the endosteum.

Inputed by Jules