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The spleen is enclosed by a capsule of dense connective tissue consisting of both collagen and reticular fibers, fibroblasts, and smooth muscle cells. At intervals, the capsule extends as trabeculae into the interior of the spleen. The parenchyma of the spleen is also known as splenic pulp, and is divided into red pulp and white pulp. The red pulp appears red in the living state due to heavy infiltration of red blood in this region. It consists of many large, thin-walled vessels called splenic sinuses and intervening thin plates of cells called the splenic cords or cords of Billroth.  SEM X34.  3.5" X 4.5"  **On Page Credit Required**