endosteum

noun, plural en·dos·te·a [en-dos-tee-uh] /ɛnˈdɒs ti ə/. Anatomy.

1. the membrane lining the medullary cavity of a bone.

noun plural -tea (-tɪə)

1. a highly vascular membrane lining the marrow cavity of long bones, such as the femur and humerus

n. pl. en•dos•te•a (-tē-ə)

1. The thin layer of cells lining the medullary cavity of a bone.medullary membrane