. The comparative anatomy of the domesticated animals. Horses; Veterinary anatomy. 878 THE NERVES. The second nei-ve, situated beneath the preceding, appears to be detached from the posterior border of the great sciatic nerve. It is placed on the external surface of the sciatic ligament, is directed backwards in passing below the croupal portion of the rectus femoris, and vastus externus and internus, passes through these muscles above the ischial tuberosity, descending underneath the sacral portion of the semitendinosus, soon to leave its deep track and become superficial. It escapes from bet
. The comparative anatomy of the domesticated animals. Horses; Veterinary anatomy. 878 THE NERVES. The second nei-ve, situated beneath the preceding, appears to be detached from the posterior border of the great sciatic nerve. It is placed on the external surface of the sciatic ligament, is directed backwards in passing below the croupal portion of the rectus femoris, and vastus externus and internus, passes through these muscles above the ischial tuberosity, descending underneath the sacral portion of the semitendinosus, soon to leave its deep track and become superficial. It escapes from between the latter muscle and the three just named, and is lost beneath the skin covering the posterior part of the thigh. Its deep portion gives. POSTERIOR PORTION OF THE LUMBO-SACRAL PLEXtTS. I, Conjoining fasciculi of the three first sacral nerves; 2, 3, 4, 5, anterior gluteal nerves ; 6, 6', 8, posterior gluteal nerves; 7, 9, branches which traverse the great sciatic ligament, and com- municate between the posterior gluteal branches and the divisions of the internal pudic nerve ; 10 11 12, 13, great sciatic nerve and its crural branches; 14, small femoro-popliteal nerve; 15, its cutaneous or peroneal-cutaneous branch. off collateral branches which reinforce the divisions of the internal pudic nerve, as well as filaments to the long branch of the semitendinosus muscle. 5. Great Sciatic or Great Femoro-popliteal Nerve (Figs. 201, 13; 475, 1, 2). This enormous nerve (the largest in the body), issues by the great sciatic opening in the form of a wide band, which is applied to the external face of the sciatic hgament. Comprised at first between that ligament and the middle gluteus, it is directed backwards in passing over the fixed insertion of the gluteus internus, and arrives behind the gemelli and quadratus femoris muscles. On leaving this point, it is inflected to descend behind the tliigh, where it is lodged in the muscular sheath formed for it by the biceps, the semitendinosu
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