The _____ is the major nerve of the sacral plexus and is the longest and thickest nerve of the body. It is actually a single name for two separate nerves, the tibial nerve and the fibular or peroneal nerve.

3000+ review questions on anatomy and physiology. 

Anatomy refers to the internal and external structures of the body and their physical relationships, whereas physiology refers to the study of the functions of those structures.