'/'//: 



PLEXUS 



1017 



panics the correspoiK lin.tr hypogastric (internal iliac) artery, and gives ofT secondary 

 plexuses that continue on the 1 mm dies of the artery to the jx'lvie viscera. Of I 

 secondary plexuses, the middle tuemorrhoidal and the vesical plexus are coniinon to 

 both sexes and are jiaired. 



The middle haemorrhoidal plexus passes on each side along the middle lurmor- 

 rhoidal artery to the rectum, where it receive* the superior ha'morrhoidal nerves and 

 sends filaments into the wall of the rectum (h'g. 722). 



FIG. 722. THK IhrouASTRic AND .- CAVTTT. (After Spalk-holz.) 



MSIK>.MI.\M. Mil! I'll' 



1-1.1 



M'.i//-.i 1111:111- 11:1 M; 



OASGUOS 



TRANSVERSE PROCESS OF FOURTH 

 LUMBAR VERTEBRA 



llYJ-til.AMHH n l\l v 



.iM/l.-Hij; PRIMARY Din. 



>/</.\ in-- in -in 



I.\ //;/. Kill Ml >y:W TKR1C 

 I LEXVS 



_j,/-:/r HI:. i. \-i-i/ OF TIII-: 

 BYPOUA8TK1C 1-/.IM .s 



- .VV.I//M 1111:111- r/:r.\K 



i-t III.MIM. //./-. i KS 



)ini:i;iiiiiii.ii. 

 J-LI:.\ i ,v 



- PUDICNB&VB 

 " Ureter 

 Voicula cminnlla 



/V.'i/.v/'.l /V l-'l.KXl'X 



"- Beotum 

 Levator ani 



r.i ivv.'.vor.v i-i. i:\r-~ or n \is 



r.RKAT C.l I7.7.'.\or\ XKRVK 



The vesical plexus receives some branches from the pelvic parts of the hypogastric 

 plexus, but is largely reinforced by the pelvic splanchnics, from the third and fourth 

 sacral nerves. Kadi part passes along the corresponding vesical arteries to the blad- 

 der, and gives off two sets of branches, namely, the sn/n-rinr ri'xirnl nerves (fig. 722), 

 which supply the upper part of the bladder-wall and send some branches to the ureter, 



