Nerve plexus nerves form the Sacral plexus. It is located on the posterior wall of pelvic cavity (pelvis minor). Nervi of the plexus innervate the perineal region, buttocks and the lower limb. The largest nerve of the human body, the sciatic nerve is the main branch, that give rami to the motor innervation of the muscles of the foot, the leg and the thigh. Common peroneal nerve and its branches innervate some part of the skin of the foot, the peroneal muscles of the leg and the dorsal muscles of the foot. Coccygeal plexus originate from S4, S5, Co1 spinal nerves. It
Unethical human experimentation in the United States was now required for all research projects involving human subjects. Under the guidelines, seven research projects involving chemical weapons and human subjects were submitted by the Chemical Corps for Secretary of the Army approval in August 1953. One project involved vesicants, one involved phosgene, and five were experiments which involved nerve agents; all seven were approved. The guidelines, however, left a loophole; they did not define what types of experiments and tests required such approval from the Secretary. Operation Top Hat was among the numerous projects not submitted for approval. It was termed a "local field exercise" by the Army