1 A ligand is any molecule that binds to a specific site on a protein or other molecule. In this case, the estrogen hormone 17-beta-estradiol is the ligand, and the estrogen receptor is the protein.  Binding turns on, or activates, a hormone receptor.
A femoral nerve block is a type of regional anesthesia in which the femoral nerve, located in the groin area, is deadened to allow surgery in the leg or knee area.
However, the femoral nerve is also motor and certainly can and does affect the quadriceps reflex and muscle. 1  Ilio hypogastric nerve (T12-L1) 2  Ilio inguinal nerve (T12-L1) 3  Genito femoral nerve (L1-L2)  Lateral Femoral Cutaneous nerve (L2- 1 3) Femoral nerve (L2-L3- L4)