MAMMALIA. 



231 



PLATE XXXV. 



FIG. I. 



THE HYPOGASTRIC PLEXUS OF THE ASS. 



(EQUUS ASINUS.) 



a. OVARY, b. Right horn of the uterus, c. Ureter, d. Bladder. 



1. Prolongation of the sympathetic nerve. 



2. Ganglion of the aortic plexus. 



3. Internal spermatic plexus ; it accompanies the spermatic artery and gives 



branches to the ovary, the fallopian tubes, and the round ligament ; a branch 

 was traced a considerable way down on the lining membrane of the uterus on 

 the left side. 



4. Hypogastric plexus ; it gives off the uterine nerves, and communicates with 



branches of the fourth and fifth sacral nerves, and in another preparation 

 with the sixth ; it then sends branches to the remains of the umbilical artery, 

 the lower part of the uterus and vagina, and communicates with the uterine 

 cord, and then terminates on the vagina, bladder, urethra, and rectum. 

 After its combination with the sacral nerves, it was intermixed with very 

 dense membrane. 



5. Uterine cord ; it receives a branch from the hypogastric plexus, and is joined 



by another, and then by a third from the point of union of the hypogastric 

 plexus with branches of the fourth and fifth sacral nerves ; it sends filaments 



