"The bone marrow is a soft pulpy tissue that lies in the spaces between the trabeculae of all bones. The marrow is active in providing a continual supply of red blood cells, white blood cells and platelets to meet the body's demand for oxygenation, immunity and coagulation.
The bone marrow is composed of a variety of cells (blood cells in all stages of development, fat cells and reticulum cells), connective tissue and a mineralized osseous matrix. ..."
Extract of Medcyclopaedia