Final answer:
The endosteum is the membrane lining the medullary cavity of a long bone, while the periosteum is found on the outer surface of the bone.
Explanation:
The membrane lining the medullary cavity of a long bone is called the endosteum. It is responsible for bone growth, repair, and remodeling. On the outer surface of the bone, you would find the periosteum, which contains blood vessels, nerves, and lymphatic vessels.
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