What does Your Spleen do?
The main thing your spleen does is filter your blood. It removes damaged or old red blood cells. The spleen also saves components from the old blood cells that can be used in the body.
There are various other things that the spleen does for your body. You can find more information here: chp.edu/CHP/Ref+spleen.
The connection between ''spleen'' (the organ) and ''melancholy'' (the temperament) comes from the humoral medicine of the ancient Greeks. One of the humours (body fluid) was the black bile, secreted by the spleen organ and associated with melancholy. In contrast, the Talmud (tractate Berachoth 61b) refers to the spleen as the organ of laughter, possibly suggesting a link with the humoral view of the organ.
In eighteenth- and nineteenth-century England, women in bad humour were said to be afflicted by the spleen, or the vapours of the spleen. In modern English, "to vent one's spleen" means to vent one's anger, e.g. By shouting, and can be applied to both males and females. Similarly, the English term "splenetic" is used to describe a person in a foul mood.
Spleen is also the formal name for an elite social group with headquarters in South Georgia. In cartilagenous and ray-finned fish the spleen is normally a somewhat elongated organ, consisting primarily of red pulp, with only a small amount of white pulp. In lungfish, the spleen is not a distinct organ, as it actually lies inside the serosal lining of the intestine.
In many amphibians, especially frogs, it takes on the more rounded form, and there is often a greater quantity of white pulp. In reptiles, birds, and mammals, white pulp is always relatively plentiful, and in the latter two groups, the spleen is typically rounded, although it adjusts its shape somewhat to the arrangement of the surrounding organs. In the great majority of vertebrates, the spleen continues to produce red blood cells throughout life; it is only in mammals that this function is lost in the adult.
Many mammals possess tiny spleen-like structures known as haemal nodes throughout the body, which presumably have the same function as the spleen proper. The only vertebrates to lack a spleen are the lampreys and hagfishes. Even in these animals, there is a diffuse layer of haematopoeitic tissue within the gut wall, which has a similar structure to red pulp, and is presumably homologous with the spleen of higher vertebrates.
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