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[Human ejaculation: physiology, surgical conservation of ejaculation].

J Hermabessiere¹, L Guy, J P Boiteux

¹Centre Félix Guyon, Clermont-Ferrand, France.

Progres En Urologie : Journal De L'Association Francaise D'Urologie Et De La Societe Francaise D'Urologie

|June 17, 1999

Summary

This summary is machine-generated.

This study investigated the two-phase ejaculation theory using transrectal ultrasonography. Findings suggest semen expulsion occurs without prostatic urethra ballooning, supporting a revised understanding of male ejaculation dynamics.

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Treatment of Ejaculatory Duct Obstruction by Seminal Vesiculoscopy Assisted Flow Modification

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Area of Science:

Urology
Reproductive Medicine
Physiology

Background:

The traditional ejaculation model involves two phases: semen accumulation in the prostatic urethra followed by expulsion.
This theory posits specific sphincter dynamics during these phases.

Purpose of the Study:

To validate or refute the established two-phase theory of ejaculation.
To dynamically analyze the physiological events during ejaculation.

Main Methods:

Utilized continuous transrectal ultrasonography for dynamic analysis in eight healthy volunteers.
Studied sixteen patients with bladder neck obstruction syndrome treated with a urethra-sparing technique.

Main Results:

Observed sequential filling of ejaculatory ducts and prostatic contractions in healthy subjects.
Noted expulsion of seminal vesicle contents into the inframontanal urethra without prostatic urethra ballooning.
Found no instances of retrograde ejaculation in treated patients.

Conclusions:

The findings challenge the necessity of prostatic urethra ballooning in the expulsion phase.
Suggests a modified understanding of ejaculation mechanics, particularly regarding sphincter function and semen transport.
The surgical technique effectively prevented retrograde ejaculation in patients with bladder neck obstruction.