3o8 Journal of Comparative Neurology. 



third sacral nerve, and lies entad of the pudic artery; the 

 sciatic root is given oft' from the sciatic nerve abont 15 mm. 

 peripherad of the union of the first and second sacral nerves, 

 in common with the sciatic root of the N. gluteus to the 

 M. glutei (Fig. N. glu.). It leaves the pelvis through the 

 sacro-sciatic foramen, and is apposed to the pudic artery; its 

 general course is meso-caudad, entad of the pudic artery and 

 vein, upon the ectal surface of the internal obturator muscle. 

 Twenty mm. peripherad of the union of the two root nerves, 

 the pudic separates into dorsal and ventral divisions, which 

 are muscular and cutaneous respectively in distribution. 



N. perineus dorsalis, 



The dorsal division (Fig. dor.), lies upon the ectal surface of 

 the rectal muscle; its branches inner ve the broad M. levator 

 ani (Fig. L. A.), the M. sphincter ani (Fig. sph. A.), and 

 30 mm. of the longitudinal rectal muscles (Fig. rec), which 

 muscles are supplied by the hemorrhoidal artery and vein. 

 The last nerve is the 



N. H.EMORRHOIDES. 



A branch is given to the anal gland (Fig. gl.) — a large 

 olive-colored gland just laterad of the anus, whose duct opens 

 ectad of the sphincter muscles, or sometimes just entad. 

 Another ramus, 



N. PERINEUS DORSALIS, 



Innerves the sphincter vaginaj and the ectal labium ( ?). 



N. PERINEUS VENTRALIS, 



71ie ventral division (Fig. ven.), is distributed to the vagina, 

 the ectal labium, the perineum, the urethra, the M. accelera- 

 tor unnag, and the trnnsverse mu'^cle just entad of the peri- 

 neal integument. A considerable ramus is given to its plate- 

 trope (Plat.) in the meson, and the nerve terminates as a 

 large nerve in the glans clitoris (N. dorsalis penis scu clitoris. 



