Innervation of the Vas Deferens and Its Importance for Vasectomy and Vasovasostomy

Abstract

The histotopographic localization of the nerves of the vas deferens was studied in dogs. The nerves of the vas are concentrated at two poles. A vasectomy with a nerve-sparing technique and a conventional vasectomy were performed in two groups of dogs. 5 months later all dogs underwent vasovasostomy. The intact nerve supply after vasectomy was controlled by electrophysical measurement. Sperm evaluation and morphological findings are compared and the advantages of a nerve-sparing technique demonstrated. The proliferative capacity of the epithelial layer of the vas deferens has to be considered in operations on the vas.

Human Vasal Changes after Vasectomy: In vitro Studies

“…Activation of these sympathetic nerve fibers may induce vasal contraction and expulsion of sperm at the time of ejaculation [19], Local injury of the nerve fibers supplying the vas and epididymis during vasectomy could lead to inadequate contraction of the excurrent duct system and ultimately impair sperm function [20]. The regeneration of these nerves may account for the slow recovery of the ejaculate [21].…”