Human leg lumbar plexus. It supplies motor innervation to iliopsoas, pectineus, sartorius, and quadriceps; and sensory branches to the anterior thigh, medial lower leg, and posterior foot. The nerves of the sacral plexus pass behind the hip joint to innervate the posterior part of the thigh, most of the lower leg, and the foot. The superior (L4-S1) and inferior gluteal nerves (L5-S2) innervate the gluteus muscles and the tensor fasciae latae. The posterior femoral cutaneous nerve (S1-S3) contributes sensory branches to the skin on the posterior thigh. The sciatic nerve (L4-S3), the largest and longest nerve in the human body, leaves the
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