ATHENAIS, ISM / SCIENCE PHOTO LIBRARY ATHENAIS, ISM / SCIENCE PHOTO LIBRARY
Spleen. Coloured ultrasound scan of a normal human spleen (between the two crosses). Situated on the left side of the upper abdomen, behind the stomach, the spleen is a large lymphoid organ of roughly oval shape. It is part of the lymphatic system, and is involved in processing white blood cells (lymphocytes). It also regulates the number of red blood cells in the bloodstream by destroying old cells. It is enclosed within a fibrous capsule that extends to form a spongy mesh-like interior. The interior consists of nodules of white pulp, which is rich in white blood cells, within a matrix of red pulp.
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