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Ejaculation in men: a dynamic endorectal ultrasonographical study

J M Gil-Vernet¹, R Alvarez-Vijande, A Gil-Vernet

¹Sant Josep Clinic, Barcelona, Spain.

British Journal of Urology

|April 1, 1994

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Dynamic endorectal ultrasonography reveals distinct pre-ejaculatory and ejaculatory phases in men. This imaging technique visualizes prostate gland changes and seminal flow dynamics during ejaculation.

Area of Science:

Reproductive Medicine
Medical Imaging
Urology

Background:

Understanding male ejaculatory mechanisms is crucial for diagnosing and treating related disorders.
Dynamic endorectal ultrasonography (EUS) offers a novel, non-invasive method to visualize internal structures during physiological processes.

Observation:

EUS recordings captured detailed dynamic changes during ejaculation in a healthy male volunteer.
The study focused on the longitudinal plane from the bladder neck to the bulbous urethra.

Findings:

A pre-ejaculatory phase was identified, marked by decreased prostate echogenicity and pre-prostatic sphincter contraction 13-25 seconds prior to ejaculation.
The ejaculatory stage included prostatic emission (2-20s), emission through ejaculatory ducts (3-14s), a seminal stoppage (3-8s), and minor urethro-vesical reflux (5-9s).

Related Experiment Videos

Bladder neck and prostate returned to baseline configuration within 10-90 seconds post-ejaculation.

Implications:

Dynamic EUS during ejaculation provides unprecedented insights into the physiological stages of male orgasm.
This technique may serve as a valuable diagnostic tool for evaluating ejaculation-related dysfunctions.
Further research can explore the clinical utility of EUS in conditions like premature ejaculation or anejaculation.