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THE LUMBO-SACRAL PLEXUS. 597 
THE LUMBO-SACRAL PLEXUS. 
The lumbo-sacral plexus is formed by the union of the anterior primary divisions 
of the remaining spinal nerves—five lumbar, fivesacral,and one coccygeal. Frequently, 
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Fic. 459.—NERVES OF THE LUMBO-SAcRAL PLEXUS. 
Sy, Sympathetic cord ; T.12, L.1, 2, 3, 4, 5, 8.1, 2, 8, 4, 5, Co, Anterior primary divisions of the last thoracic, 
the lumbar, sacral, and coccygeal nerves; Q, Nerves to quadratus lumborum ; Ps, Nerves to psoas 
muscle ; G.C, Genito-crural nerve ; Il, Iliac branches of last thoracic and ilio-hypogastric nerves ; Hy, 
Hypogastric branch of Hio-hypogastric nerve ; I.1, Ilio-inguinal nerve ; E.C, External cutaneous nerve ; 
A.C, Anterior crural nerve ; Obt, Obturator nerve ; Py, Nerves to pyriformis muscle ; 0.1, Nerve to 
obturator internus ; Q.F, Nerve to quadratus femoris muscle; Art, Articular branch ; 8.G, Superior 
gluteal nerve; I.G, Inferior gluteal nerve; P, Peroneal nerve ; Bi.2, Nerve to short head of biceps muscle ; 
T, Tibial nerve ; Art, Articular branch ; H.S, Nerve to the hamstring muscles ; Bi.1, Nerves to biceps 
(long head), and St.1, to semitendinosus ; St.2, Semitendinosus ; Sm, Semimembranosus ; A.m, Adductor 
magnus ; 8.Sc, Small sciatic nerve ; Perf, Perforating cutaneous nerve ; Pud, Pudic nerve ; M, Muscular 
branches ; Per, Perineal branch of fourth sacral ; A.Co, Anterior sacro-coceygeal nerve. 
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