166 



Spinal Nerves. 



M. sphinct. ani ext. 



M. tevat. ani 



M. g^lutaeus 

 magnus 



N. HAEMOBRHOID. INF. 



N. PUDEND. 



. CUTAN. FEW. POST. 



N. PERINEAL. 



M. PENIS. DORSAL 



M. bulbo-cavern. 

 M. ischio-cavern. 



N. SCROTAL. POST. 



510. The Brandies of the Plexus pudendalis. 



The Plexus pudendalis, lying at the lower border of the M. pyri- 

 formis, gives off the following branches: 



1. The middle and inferior haemorrhoidal nerves, 

 N. Itaemorrhoidalis medius ct inferior, which, communicating with each other 

 and the pelvic plexuses of the sympathetic, supply the base of the 

 bladder, the vagina, the AT. levator and sphincter ani cxt. et int. 



2. The pudic nerve, N. pudcndus, leaves the pelvis through the 

 great sacro-sciatic foramen and reenters it through the lesser sacro- 

 sciatic foramen ; it gives off two terminal branches : 



a) The perineal nerve, N. perimalis, which passes to the peri - 

 naeum and supplies the integument, the JD/. transversi per in., accelerator 

 urinae (bulbo-cavernosus) and spliinder ani ext., and the scrotum (Nervi scrotahs 

 poster lores) ; in the female it supplies the labia and Vestibulum vaginae 

 (Ncrvi labiales poster tores). 



b) The dorsal nerve of the penis, N. penis dorsalis, which 

 passes between AD/, accelerator urinae and erector penis beneath the pubic 

 symphisis, from there to the penis ; in the female to the clitoris. 



The Plexus coccyyeus ends in the J/. sphincter ani ext., levator ani 

 and in the skin of the anus. 



