614 THE NERVOUS SYSTEM. 
Branches.—The small sciatic is a purely cutaneous nerve. Tt supplies branches 
to the perineum, buttock, thigh, and leg. 
The perineal branch (rr. perineales; inferior pudendal nerve; long scrotal 
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Fic. 446.—NERVES OF THE LUMBO-SACRAL PLEXUS. 
Sy, Sympathetic cord ; 1.12, L.1, 2, 3, 4, 5, 8.1, 2, 3, 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 ; Tl, Hiac’ branches of last thoracic and ilio-hypogastric nerves ; Hy, 
Hypogastric branch of ilio-hypogastric nerve ; I.I, Iio-inguinal nerve ; E.C, External cutaneous nerve ; 
A.C, Anterior crural nerve ; Obt, Obturator,nerve ; Py, Nerves to pyriformis muscle ; O.I, Nerve to 
obturator internus ; Q.F, Nerve to quadratus femoris muscle; Art, Articular branch ; 8.G, Superior 
gluteal nerve ; 1.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.l, Nerves to biceps 
(long head), and St.1, to semitendinosus ; St.2, Semitendinosus ; Sm, Semimembranosus ; A.m, Adductor 
magnus ; 5.Sc, Small sciatic nerve ; Perf, Perforating cutaneous nerve ; Pud, Pudic nerve ; M, Muscular 
branches ; Per, Perineal branch of fourth sacral ; A.Co, Anterior sacro-coccygeal nerve. 
