Anterior and posterior branches of spinal nerves L1-L4, L4-L5, S1-S4 Supplies external genitals & anterior/medial thigh Femoral nerve (L2-4) supplies buttocks, perineum and part of lower limb Sciatic nerve (L4-S3) supplies posterior thigh and rest of leg below knee Sciatic nerve injury can occur due to a herniated (slipped) disc, pressure from the uterus during pregnancy or an improperly administered gluteal injection