Bone marrow?

Bone marrow is the spongy tissue inside some of your bones, such as your hip and thigh bones. Bone marrow is the spongy tissue inside some of the bones in the body, including the hip and thigh bones. Bone marrow is a semi-solid tissue found within the spongy or cancellous portions of bones. Bone marrow is the soft, spongy tissue inside your bones that makes blood-forming cells (blood stem cells). The soft, sponge-like tissue in the center of most bones. Bone marrow is found in the medullary cavities – the centres of bones.