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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.
Red blood cells, platelets and most white blood cells arise in red marrow, although some white blood cells develop in yellow marrow. The color of yellow marrow is due to the much higher number of fat cells. Both types of bone marrow contain numerous blood vessels and capillaries which enter the bone.Even though we tend to think of bone as hard, dead material, it's very much alive and contains a vast network of blood vessels.ed blood cells are produced in spongy bone marrow, transport through canaliculi into small capillaries in the periosteum. These tiny blood vessels expand after they exit the compact bone, into larger caplliaries, and eventually the major blood stream.