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.
Preemptive nerve blocks are meant to prevent subsequent pain from a procedure that can cause problems including phantom limb pain. Nerve blocks can be used, in some cases, to avoid surgery. Types of Nerve Blocks. Various areas of pain require different nerve block types. Below are a few of the available nerve blocks and some parts of the body where they are used. Trigeminal nerve blocks (face) Ophthalmic nerve block (eyelids and scalp) Supraorbital nerve block (forehead)