Functions of the Spleen
The Spleen governs the muscles and the four extremities.
Commentary: The Spleen provides Qi and Blood for the muscles and the four extremities. The fullness and strength of the limbs depends on the Spleen's function of transportation and transformation. The activity of the limbs depends on yang Qi which is produced by the Spleen. If the Spleen function is weak, the extremities are no longer sufficiently supplied with Qi and Blood. The muscles become weak and cold, even atrophy can develop. For example, some athletes present weaker muscles on one side of the body, despite balanced training. Impairment of the Spleen function can manifest in health problems, that appear simultaneously in all four extremities.