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 essential for activities of daily life including walking and climbing stairs. Without it, the lower limb becomes severely impaired. In this article we will discuss its course, its motor and sensory innervation as well as clinical relevance.