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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.
Types of Bone Marrow. There are two types of bone marrow, red marrow and yellow marrow. Red bone marrow is found mostly in the ribs, skull, vertebrae, and pelvic bones. It is also the only type of bone marrow found in children. It is red because this is the type of marrow that produces red blood cells.one marrow is found in bones such as the sternum (breastbone), ribs, the pelvis and the skull. It is also found in the large bones of the arms (the humerus) and the legs (the femur). Some marrow is found in what is called spongy bone, which is different from the hard outer shell called compact bone.