Function of the Posterior Urethra in Ejaculation and its Importance for Urine Control

Influence of the sympathetic nervous system on the lower urinary tract and its clinical implications

“…On stimulation of the presacral nerve during operations Learmonth [1931] observed a contraction of the internal sphincter. This finding was confirmed by Stockamp and Schreiter [1974] when they studied the bladder neck endoscopically at the moment the presacral nerve was dissected during retroperitoneal lymphadenectomy . Kleeman [ 19701 suggested that a-adrenolytic drugs may have a marked effect on voiding under some circumstances, supplying clinical evidence of a sympathetic influence on the internal sphincter.…”

A New Theory of Micturition and Urinary Continence Based on Histomorphological Studies

“…Other authors speak at least of a sealing of the ejaculatory ducts by the dorsal longitudinal urethral muscle system during micturition [6], Homsy [7] declines an involve ment of the urethral crest in both processes. In the func tional respect, examinations seem to be interesting when, by means of stimulation of nerves having a function of the coordination of the sexual function, they had shown that in the process of emission of semen there is a contraction of the sphincter vesicae and of the longitudinal urethral muscle system, respectively [8][9][10], …”

Physiology and Genetics of Reproduction

“…This closure against the bladder lumen is performed not only by the so-called internal sphincter but also by a muscular contraction which drives the collicle toward the lumen in a pluglike fashion ( Fig. 1) (Rose, 1953;Stockamp and Schreiter, 1974;Gennser and Wehlin, 1969). At the same time-and probably at least in part because of this movement of the collicle-the infracollicular urethra opens up to form a chamber large enough for collection of a small volume of semen.…”