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. The femoral nerve is one of the major peripheral nerves of the lower limb. In this article, we shall look at the anatomy of the femoral nerve â its anatomical course, motor and sensory functions, and any clinical relevance.