nervus ischiadicus, wanda kuma aka sani da jijiyar sciatic, shine mafi girma kuma mafi tsayi a cikin jikin mutum. An kafa shi ta wasu tushen jijiya na kashin baya, musamman sassan L4 zuwa S3 na kashin baya. Jijiya tana gudana daga baya baya, ta cikin gindi, da kuma bayan cinya, kuma ta rabu zuwa rassa biyu, jijiyar tibial da jijiyar peroneal, wanda ke ci gaba da ƙasa zuwa ƙafa. nervus ischiadicus yana da alhakin samar da abin jin daɗi da aikin motsa jiki zuwa ƙananan sassan.