sciatic nerve n.
A nerve that arises from the sacral plexus and passes through the greater sciatic foramen to about the middle of the thigh where it divides into the common peroneal and tibial nerves.
|sciatic nerve (sī-āt'ĭk) Pronunciation Key
A thick nerve that arises in the lower part of the spine and passes through the pelvis on its way to the back of the leg. It carries sensory information from the leg to the central nervous system and controls the action of many muscles. The sciatic nerve is the largest nerve in the body.