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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.
Both red bone marrow and a central focus of yellow bone marrow are visible. The two types of bone marrow are red marrow (Latin: medulla ossium rubra), which consists mainly of hematopoietic tissue, and yellow marrow (Latin: medulla ossium flava), which is mainly made up of fat cells.he red bone marrow is a key element of the lymphatic system, being one of the primary lymphoid organs that generate lymphocytes from immature hematopoietic progenitor cells. The bone marrow and thymus constitute the primary lymphoid tissues involved in the production and early selection of lymphocytes.