Horse Anatomy Exam 1 Practice

Endosteum refers to which anatomical structure?

Outer lining of a bone Inner lining of a bone Bone marrow Blood vessel layer

Correct Answer:

Inner lining of a bone

Explanation:

Endosteum is the inner lining of bone—a delicate membrane that coats the inner surfaces, including the medullary (marrow) cavity and the trabeculae of cancellous bone. It contains osteogenic cells that can become osteoblasts, supporting bone growth and remodeling from inside the bone. The outer surface is the periosteum, not endosteum, and bone marrow resides within the cavities rather than forming the lining, so the endosteum specifically refers to that inner lining.

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