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Bone Marrow
There are two types of bone marrow, red marrow and yellow marrow.
- Red blood cells, platelets and most white blood cells arise in red marrow; some white blood cells develop in yellow marrow.
- Both types of bone marrow contain numerous blood vessels and capillaries.
- Red marrow is found mainly in the flat bones, such as the hip bone, breast bone, skull, ribs, vertebrae and shoulder blades, and in the cancellous ("spongy") material at the proximal ends of the long bones femur and humorous.
- Yellow marrow is found in the hollow interior of the middle portion of long bones.
- In cases of severe blood loss, the body can convert yellow marrow back to red marrow in order to increase blood cell production.