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Spleen

splenic capsule (capsula splenica)
blood vessel
mesothelium /peritoneum
nucleus of smooth muscle cell
white pulp (pulpa splenica alba)
red pulp (pulpa splenica rubra)

Cross section of the spleen of a pigeon (HE): detail of the capsule

The capsule of the spleen consists of two layers: an outer part of mainly collagen fibers and an inner part with elastic fibers (not visible on HE). Smooth muscle cells are fairly numerous. A mesothelium (the peritoneum) lines the capsule.