The spleen was felt by the ancient Greeks and Romans to play a significant role in human physiology. Aristotle thought that the spleen was on the left side of the body as a counterweight to the right-sided liver.1 He believed that the spleen was important in drawing off "residual humors" from the stomach. The spleen was also felt to "hinder a man's running," and Pliny reportedly claimed that "professed runners in the race that bee troubled with the splene, have a devise to burne and waste it with a hot yron [AKA they burned it away by jabbing themselves in their left flank with a hot iron] ."2
The exceptional speed of giraffes was felt to be related to the erroneous belief that giraffes were asplenic [without a spleen]. Early references to removal of the spleen to increase speed make it apparent that it has
long been known that the spleen is not absolutely necessary to sustain life.
[PS- A study in 1992 in rats confirmed that after their spleens were removed they could indeed run faster]
The exceptional speed of giraffes was felt to be related to the erroneous belief that giraffes were asplenic [without a spleen]. Early references to removal of the spleen to increase speed make it apparent that it has
long been known that the spleen is not absolutely necessary to sustain life.
[PS- A study in 1992 in rats confirmed that after their spleens were removed they could indeed run faster]