Bone Marrow

**Semantic type:** Body Part, Organ, or Organ Component

**Definition:** 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.

**Synonyms:** - BONE MARROW - Bone marrow - Bone marrow structure (body structure) - Marrow - Reticuloendothelial System, Bone Marrow - bone marrow - bone marrow - medulla ossea - medulla ossium