Electro-physiology and electro-therapeutics : showing the best methods for the medical uses of electricity / By Alfred C. Garratt.

We must here notice again the obturator nerve, which arises from the lumbar plexus, and with the obturator artery escapes from the pelvis to supply first the obturator extermts, then pass- ing in front of the adductor brevis muscle, supplying the adduc- tor longus and the gracilis, and a branch ramifies the adductor magnus; then, from this, a long cutaneous branch proceeds to the plexus of the short saphenous nerve, and gives nervelets to the integument all along the inner side of the calf of the leg; but, before this, it gives some branches to the synovial mem- brane on the posterior aspect of the knee joint. The great ischiatic nerve, excepting the brain and spinal mar- row, is the largest nervous cord in the human body. It has its roots in the sacral and lumbar plexuses, hut more directly from the latter. It is, indeed, the great prolongation or ex- tension of the lower spinal nerves, but its large size forms only at, and not before its exit from the great sacro-ischiatic fo- ramen, where it measures three quarters of an inch in breadth. It descends from beneath the pyriformis muscle, through the middle of the space between the tro- chanter major and the tuberosity of the ischium, and so along down the posterior aspect of the thigh, to about its lower third, where we see it divides into two, the popliteal and the peroneal branches. This division sometimes occurs farther up, but its course is always the same. The nerve in this route down the thigh Grc£sciatic Nerves" show! rests upon the gemellus superior, the ten- ins "then Branches of the u- , chiatic Plexus to the Hip and don of the obturator interims, gemellus BaCk of the Thigh. 1,1. The Posterior Sacral Nerves. 2. Nervi Glutei. 3. The Internal Pubic Nerve. 4. The Lesser Ischiatic Nerve, giving off the Peroneal Cutaneus, and, 5. The Ramus Feraoralis Cutaneus Pos- terior. 6. Great Ischiatic, more frequently called the Sciatic Nerve.