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.
The femoral nerve is located inside the leg and provides muscles that help the leg to bend and straighten. It also allows people to feel sensations within the front part of the thigh and a section of the lower leg.he femoral nerve is located inside the leg and provides muscles that help the leg to bend and straighten. It also allows people to feel sensations within the front part of the thigh and a section of the lower leg.