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Anatomy Atlases: Atlas of Microscopic Anatomy: Section 1 - Cells Atlas of Microscopic Anatomy: Section 4 - Blood

Plate 4.56: Red Bone Marrow

In situ

Ronald A. Bergman, Ph.D., Adel K. Afifi, M.D., Paul M. Heidger, Jr., Ph.D.
Peer Review Status: Externally Peer Reviewed


RED BONE MARROW
In situ

Plate 4.56: Red Bone Marrow

Human, Müller's fluid, H. & E., 50 x.

In this plate, a layer of compact bone surrounds the red bone marrow cavity.

Red or hemopoietic marrow is the characteristic variety of marrow until middle childhood. By late adolescence, most red marrow is replaced by fatty or yellow bone marrow. In adults, red marrow occurs in the sternum, ribs, vertebrae, heads of long bones, and cranium.

Red marrow is characterized by high cellularity and sinuses filling spaces between a delicate reticular supporting tissue. The cells seen are giant megakaryocytes and developing red and white blood cells.

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