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Bone marrow is the soft, sponge-like tissue that fills the hollow center of bones. There are two types of bone marrow: red marrow and yellow marrow. Red Marrow-Consisting mainly of hematopoietic tissue, or tissue involved in the formation of red blood cells, all bone marrow is red at birth.About 50% of red marrow converts to yellow marrow over time.one marrow is the soft, sponge-like tissue that fills the hollow center of bones. There are two types of bone marrow: red marrow and yellow marrow. Red Marrow-Consisting mainly of hematopoietic tissue, or tissue involved in the formation of red blood cells, all bone marrow is red at birth.
1. The soft tissue in the marrow cavities of long bones (yellow marrow) and in the spaces between trabeculae of spongy bone in the sternum and other flat and irregular bones (red marrow). Yellow marrow consists principally of fat cells and connective tissue and does not participate in hematopoiesis.he term is often restricted to mean bone marrow. bone marrow the soft, organic, spongelike material in the cavities of bones; called also medulla ossium. It is a network of blood vessels and special connective tissue fibers that hold together a composite of fat and blood-producing cells.