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The capsule and trabeculae of the red pulp of the spleen (400X)

Microimage
Image copyright: University of Oslo, CC BY-NC-ND 4.0. (Tissue stain: H+E).

The capsule and trabeculae of the red pulp is made of connective tissue and smooth muscle. Arteries and veins can also be found within the larger trabeculae in the red pulp.