Heterogeneous anatomical cluster, each instance of which consists of meshwork of some connective tissue filled with marrow cells, such as myelocytes, megakaryocytes and fat cells, and located within cavity of some bone.

Soft tissue filling the cavities of bones; exists in two types, yellow and red; yellow marrow is found in the large cavities of large bones and consists mostly of fat cells and a few primitive blood cells; red marrow is a hematopoietic tissue and is the site of production of erythrocytes and granular leukocytes; bone marrow is made up of a framework of connective tissue containing branching fibers with the frame being filled with marrow cells.

The soft tissue filling the cavities of bones. Bone marrow exists in two types, yellow and red. Yellow marrow is found in the large cavities of large bones and consists mostly of fat cells and a few primitive blood cells. Red marrow is a hematopoietic tissue and is the site of production of erythrocytes and granular leukocytes. Bone marrow is made up of a framework of connective tissue containing branching fibers with the frame being filled with marrow cells.

The soft, sponge-like tissue in the center of most bones. It produces white blood cells, red blood cells, and platelets.

The tissue occupying the spaces of bone. It consists of blood vessel sinuses and a network of hematopoietic cells which give rise to the red cells, white cells, and megakaryocytes.

Bone marrow is the soft, spongy, gelatinous tissue found in the hollow spaces in the interior of bones. The average weight of this tissue is about 4% of the total body weight, or 2.

Bone marrow, soft, gelatinous tissue that fills the cavities of the bones. Bone marrow is either red or yellow, depending upon the preponderance of hematopoietic (red) or fatty (yellow) tissue. In humans the red bone marrow forms all of the blood cells with the exception of the lymphocytes, which...