Which term is the membranous lining of the hollow cavity of a bone?

Which term is the membranous lining of the hollow cavity of a bone?

• A. Endosteum
• B. Epiphysis
• C. Haversian canal
• D. Ethmoid bone

Answer: (A)

Endosteum is the membranous lining of the hollow cavity of a bone. It coats the inner surfaces of bone, including the medullary (marrow) cavity and the inner trabeculae of spongy bone. This thin layer houses osteoprogenitor cells and osteoblasts, and it participates in bone remodeling and growth by resorbing or laying down bone from the inside. That inner lining is distinct from the outer covering, the periosteum, which lines the outer surface. The other terms refer to a part of bone, a central canal within an osteon, or a skull bone, not the inner lining of the cavity.

Endosteum is the membranous lining of the hollow cavity of a bone. It coats the inner surfaces of bone, including the medullary (marrow) cavity and the inner trabeculae of spongy bone. This thin layer houses osteoprogenitor cells and osteoblasts, and it participates in bone remodeling and growth by resorbing or laying down bone from the inside. That inner lining is distinct from the outer covering, the periosteum, which lines the outer surface. The other terms refer to a part of bone, a central canal within an osteon, or a skull bone, not the inner lining of the cavity.