. An analytical compendium of the various branches of medical science, for the use and examination of students. Anatomy; Physiology; Surgery; Obstetrics; Medicine; Materia Medica. SACRAL NERVES. 167 the pelvis at the upper portion of the thyroid foramen, buted upon the obturator and adductor muscles. It is distri- SACRAL NERVES. Fig. 145. These are five and sometimes six in number; the anterior trunks, with a portion of the last dorsal, constitute the sacral plexus. From it are given off a few small branches and to the viscera and muscles within the pelvis. There also arise from it the gluteal
. An analytical compendium of the various branches of medical science, for the use and examination of students. Anatomy; Physiology; Surgery; Obstetrics; Medicine; Materia Medica. SACRAL NERVES. 167 the pelvis at the upper portion of the thyroid foramen, buted upon the obturator and adductor muscles. It is distri- SACRAL NERVES. Fig. 145. These are five and sometimes six in number; the anterior trunks, with a portion of the last dorsal, constitute the sacral plexus. From it are given off a few small branches and to the viscera and muscles within the pelvis. There also arise from it the gluteal,^ which emerging from the sacro-sciatic notch, divides into two large branches to supply the glutei muscles. The i7?ter97al pudic^ or supe- rior long pudendal^ which accompanies the internal pudic artery, and supplies the perineum, and organs of generation; it divides into two branches, the superior continuing to the extremity of the penis with the dorsal artery. The lesser ischiatic* divides into the inferior long pudefidal, which winds around the tuberosity of the ischium, and is distributed to the integuments of the perineum ; and the posterior cutaneous^ a long filament passing down the back of the thigh and leg, to be spent upon the integuments. The great sciatic^ is the largest nerve in the body ; it escapes from the pelvis beneath the pyrifor- mis muscle, and descends the back of the thigh between the flexor muscles ; about one- third above the knee it divides into two large branches, called peroneal and popliteal. The popliteal descends through the popli- teal space, giving off numerous muscular branches, one of which is the external saphe- nous nerve, which becomes superficial near the ankle, and is joined by the external peroneo-cutaneous nerve; it then passes behind the external malleolus, and supplies the external malleolus and the foot. The posterior tibial is a con- tinuation of the popliteal, descending the back of the leg in company with the posterior tibial ar
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