The local anesthesia is injected so that the pudendal nerves are numbed. Local Local perineal anesthesia is injected directly into the perineum. This is used before an episiotomy is made. A fine needle is placed between the bones of the back into the spinal fluid, the fluid that surrounds the spinal cord. A small amount of spinal fluid is withdrawn and the same amount of anesthetic is placed into the fluid.
Spinal anesthesia works immediately but it only lasts about an hour.
This is good for c-sections.