Red Marrow Location in Adult Long Bones: Epiphyses, Not Diaphysis

Correction: In adults, red (hematopoietic) marrow resides in the spongy bone of epiphyses (proximal femur, humerus) and axial skeleton (vertebrae, ribs, sternum, pelvis).

The diaphysis (shaft) contains yellow (fatty) marrow. The central canal (medullary cavity) houses yellow marrow in adults.

Red marrow persists in flat bones and vertebral bodies throughout life. In severe anemia/hypoxia, yellow marrow can revert to red (reconversion).