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Anatomy Atlases: Atlas of Microscopic Anatomy: Section 1 - Cells Atlas of Microscopic Anatomy: Section 9 - Lymphatic System

Plate 9.175 Spleen: Red Pulp

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


SPLEEN
Red pulp

Plate 9.175 Spleen: Red Pulp

Human, Zenker's fluid, Mallory's stain, 612 x.

Venous sinuses: Form an anastomosing plexus through the red pulp between the pulp cords. Highly distensible in the living state.

Cords: Loose lymphatic tissue arranged in anastomosing cords and plates characterizes the red pulp of the spleen. Also termed Billroth or splenic cords. The cords contain varying numbers of red blood corpuscles, lymphocytes, plasma cells, and monocytes. Between cords are the venous sinusoids.

Blood cells: Fill the venous sinusoids, and impart the red color to the pulp in the fresh unfixed state.

Lining cells: Sinusoids are lined by phagocytic reticular cells belonging to the widespread macrophage (reticuloenclothelial) system. Shape changes with state of distention of the sinus.

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