ABDOMEN AND PELVIS 535 



(ac) Posterior cutaneous nerve of thigh (TV. cutaneus femoris pos- 



terior). 



(aca) Inferior nerves of buttocks (Nn. clunium infe- 



riores ) . 



(acb) Perineal branches (rami perineales). 



(ad) Sciatic nerve (N. ischiadicus) . 



(ada) Muscular branches (rami musculares). 



(adb) Common peroneal nerve (N. peronaeus communis). 



(adba) Muscular branches (rami musculares). 

 (b) Pudendal plexus (plexus pudendus). 



(ba) Middle hemorrhoidal nerves (Nn. haemorrhoidales medii). 



(bb) Inferior vesical nerves (Nn. vesicales inferiores). 

 (be) Vaginal nerves (Nn. vaginales) (in the female). 



(bd) Pudendal nerve (N. pudendus). 



(bda) Inferior hemorrhoidal nerves (Nn. haemorrhoidales 



inferiores). 



(bdb) Nerve of perineum (N. perinei). 



(bdc) Posterior scrotal or labial nerves (Nn. scrotales vel 



labiales posteriores) . 



(bdd) Dorsal nerve of penis or of clitoris (N. dorsalis 



penis vel clitoridis). 



(be) Coccygeal nerve (N. coccygeus}. 



(bea) Anococcygeal nerves (Nn. anococcygei). 



Sacral Part of Sympathetic (Sy sterna sympathicum, pars pelvina). 

 (Vide Toldt, Fig. 1327.) 



Determine the number of sacral ganglia (ganglia sacralia) 

 and their relation to the sacral foramina. What is the relation 

 of the sacral division of the sympathetic trunk to the lumbar 

 division! What is the unpaired ganglion (ganglion impar)* 

 Determine the distribution of fibres given off from this part of 

 the sacral trunk. 



Removal of the Pelvic Viscera. 



Divide the vessels and nerves which are connected with the 

 viscera, also the M. levator ani and the puboprostatic ligaments. 

 Free the membranous portion of the urethra from the pubic 

 arch, avoiding any injury to the urethral walls. Dissect the 

 urethra away from the coccyx and remove the viscera. 



Pelvic Muscles. 



Study now the form, position, origin, insertion, action, and 

 innervation of the following muscles. (Vide Spalteholz, Fig. ' 

 373.) 



(a) Internal obturator muscle (M. obturator internus). 



(b) Piriform muscle (M. piriformis). 



