An analysis of the axon populations in the nerves to the pelvic viscera in the rat
Article first published online: 9 OCT 2004
Copyright © 1982 Alan R. Liss, Inc.
Journal of Comparative Neurology
Volume 211, Issue 1, pages 1–10, 10 October 1982
How to Cite
Hulsebosch, C. E. and Coggeshall, R. E. (1982), An analysis of the axon populations in the nerves to the pelvic viscera in the rat. J. Comp. Neurol., 211: 1–10. doi: 10.1002/cne.902110102
- Issue published online: 9 OCT 2004
- Article first published online: 9 OCT 2004
- Manuscript Accepted: 1 JUN 1982
The present study uses selective surgical ablations combined with electron microscopic analyses to determine the number of axons in yarious catagories in rat hypogastric, pelvic, and pudendal nerves, these being the nerves to the pelvic viscera in this animal. Unmyelinated fibers predominate in all of these nerves. One of the most significant findings is that the pelvic nerve contains almost as many postganglionic sympathetic fibers as the hypogastric nerve. Previous investigators thought that the pelvic nerve supplied the parasympathetic inflow and the hypogastric nerve the sympathetic inflow to the pelvic viscera. The finding that there is a sizable sympathetic component in the pelvic nerve negates this idea, at least for the rat, and presumably calls for a reevaluation of the syndromes that arise from pelvic as opposed to hypogastric nerve section. Other findings of interest are (1) that there are unmyelinated efferent axons in the pudendal nerve, indicating that the pudendal is not a typical somatic nerve, (2) that the hypogastric nerve has a very small sensory component, and (3) that there are fibers surviving in the distal stumps of all these nerves, particularly the pelvic and hypogastric nerves.