Bone marrow (lat. medulla ossium) is the inner part of the bone, consisting of loose fibrous connective tissue containing hematopoietic cells.
The bone marrow fills the cavity of the tubular bones and the cells of the spongy bones. It consists of adipose tissue, blood vessels and nerves, as well as hematopoietic cells (erythroblasts, megakaryocytes, etc.).
The main function of bone marrow is hematopoiesis. Here the formation of red blood cells, white blood cells and platelets occurs. In addition, old red blood cells are destroyed in the bone marrow.
Bone marrow plays an important role in the metabolic processes of bone tissue and participates in mineral metabolism. It is also a fat depot and has immunological properties.