Bone marrow is a soft, spongy tissue found inside the medullary cavity of bones. It is responsible for producing blood cells, including red blood cells, white blood cells, and platelets, and also serves as a storage site for fat.

The coverings of bone refer to the two specialized membranes that line the outer and inner surfaces of bones: periosteum and endosteum.

The structure of bone refers to its organized anatomical composition, which can be studied at both the microscopic (histological) and macroscopic (gross) levels.

Osteology is the study of bones, the hardest structure in the body excepting teeth. Bones support and protect the tissues of the body