988 



NEUROLOGY 



from the second, third, and fourth sacral nerves, and by a few filaments from the 

 first two sacral ganglia. At the points of junction of these nerves small ganglia are 

 found. From these plexuses numerous branches are distributed to the viscera of 

 the pelvis. They accompany the branches of the hypogastric artery. 



The Middle Hemorrhoidal Plexus (plexus hccmorrhoidalis medius) arises from the 

 upper part of the pelvic plexus. It supplies the rectum, and joins with branches 

 of the superior hemorrhoidal plexus. 





GREATER SPLANCHNI 



.CELIAC GANGLION 



LOWEST THORACIC 

 GANGLION 



UPPER LUMBAR 

 GANGLION 



RENAL PLEXUS 



AORTIC PLEXUS 



LUMBAR SYMPATHETIC- 

 VENA CAVA INFERIOR -. 

 COMMISSURE BETWEEN 

 AORTIC AND HYPOGAS- 

 TRIG PLEXUSES 



COMMON ILIAC 



ARTERY 

 UPPER SACRAL 

 GANGLION 



RECTUM 

 HYPOGASTRIC 

 PLEXUS 



CELIAC PLEXUS 



SUPERIOR MESEN- 

 TERIC PLEXUS 



SMALL IN- 

 TESTINE 



INFERIOR MESEN- 

 TERIC PLEXUS 



VESICAL 

 PLEXUS 

 BLADDER 



-URETER 



. VESICULA 



SEMINALIS 



SPERMATIC 



PLEXUS 



-PROSTATE 



FIG. 849. Lower half of right sympathetic cord. (Testut after Hirschfeld.) 



The Vesical Plexus (plexus vesicalis) arises from the forepart of the pelvic plexus. 

 The nerves composing it are numerous, and contain a large proportion of spinal 

 nerve fibers. They accompany the vesical arteries, and are distributed to the sides 

 and f undus of the bladder. Numerous filaments also pass to the vesiculse seminales 

 and ductus deferentes; those accompanying the ductus deferens join, on the sper- 

 matic cord, with branches from the spermatic plexus. 



The Prostatic Plexus (plexus prostaticus) is continued from the lower part of the 

 pelvic plexus. The nerves composing it are of large size. They are distributed 

 to the prostate vesiculse seminales and the corpora cavernosa of the penis and 

 urethra. The nerves supplying the corpora cavernosa consist of two sets, the 



