MR. T. SNOW BECK ON THE NERVES OP THE UTERUS. 
233 
These sacral branches pass down by the side of the pelvic plexus, but have no com- 
munication with it. 
66.66.66.66. Small ganglia formed on the nerves before they enter the erectile 
tissue. 
67.6/. 6 7-6/. Branches which enter the erectile tissue at the lower and anterior 
part of the vagina (L). 
68.68.68. Branches which come from the posterior part of the pelvic plexus 
(61.61, &c.), and are distributed to the rectum. 
PLATE XII*. 
A finished engraving of the preceding plate. 
PLATE XIII. 
Showing the posterior part of the pelvic plexus, which lies upon the rectum. This 
portion of the plexus is concealed in Plate XII. by the sacral nerves (47 and 49.49), 
and by the branches of the sacral nerves (59 and 60.60) lying upon it. 
A. The upper part of the rectum. 
B. The sphincter ani. 
C. Fibres of the levator ani. 
D. The two trunks of the superior hsemorrhoidal artery, as in Plate XII. The artery 
divides into branches which are distributed over the surface of the rectum. 
1. A portion of the fourth sacral nerve. 
2. A branch from the fourth sacral nerve sent to the levator ani. 
3.3. Branches from the fourth sacral nerve which enter the posterior part of the 
pelvic plexus. 
4. Three branches which come from the lower part of the superior aortic plexus 
(21.21, Plate XII.), and accompanying the superior hsemorrhoidal artery, end in the 
posterior part of the pelvic plexus. 
5.5. Branches from the superior aortic plexus, which accompany the superior divi- 
sions of the hsemorrhoidal artery, before the formation of the pelvic plexus. 
6.6.6. The divided ends of branches which enter into the formation of the pelvic 
plexus. 
7. A branch distributed to the vaginal erectile tissue. 
8. Small ganglion on this branch. 
9.9.9.9. Branches from the pelvic plexus, which are distributed to the rectum. These 
branches follow the course of the arteries for some way, but leave the vessels in their 
ultimate distribution to the gut. They consist of gelatinous and tubular fibres in 
nearly equal proportions. 
10.10. Small ganglia on the hsemorrhoidal nerves. 
2 h 2 
