sciatic nerve: arises from the sacral plexus and passes about halfway down the thigh where it divides into the common peroneal and tibial nerves
nerve: any bundle of nerve fibers running to various organs and tissues of the body
mimamsa: (from the Sanskrit word for `reflection' or `interpretation') one of six orthodox philosophical systems or viewpoints on ritual traditions rooted in the Vedas and the Brahmanas as opposed to Vedanta which relies mostly on the Upanishads