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Related Concept Videos

Male Sexual Response: Erection & Ejaculation01:17

Male Sexual Response: Erection & Ejaculation

Sexual stimulation can take various forms, such as physical touch and visual or auditory cues. When this happens, the parasympathetic reflex in the sacral portion of the spinal cord is activated. This reflex stimulates the release of nitric oxide (NO), which then dilates the arterioles in the penis, increasing blood flow to the erectile tissues - the corpora cavernosa and corpus spongiosum.
The blood filling the erectile tissues compresses the veins, which helps to prevent blood from leaving...

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Related Experiment Video

Updated: Jun 23, 2026

Dissection of Pelvic Autonomic Ganglia and Associated Nerves in Male and Female Rats
09:48

Dissection of Pelvic Autonomic Ganglia and Associated Nerves in Male and Female Rats

Published on: March 7, 2020

Differences in the spinal command of ejaculation in rapid ejaculating rats.

Aren J Borgdorff1, Anne-Sophie Rössler, Pierre Clément

  • 1Pelvipharm Laboratories, Orsay, France. aren.borgdorff@gmail.com

The Journal of Sexual Medicine
|May 21, 2009
PubMed
Summary
This summary is machine-generated.

Premature ejaculation variations are linked to differences in the spinal command of ejaculation. Rapid ejaculators show an accelerated expulsion phase, indicating a neurophysiological basis for ejaculation latency.

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Intracavernosal Pressure Recording to Evaluate Erectile Function in Rodents
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Related Experiment Videos

Last Updated: Jun 23, 2026

Dissection of Pelvic Autonomic Ganglia and Associated Nerves in Male and Female Rats
09:48

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Published on: March 7, 2020

Intracavernosal Pressure Recording to Evaluate Erectile Function in Rodents
08:03

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Published on: June 6, 2018

Area of Science:

  • Neuroscience
  • Reproductive Biology
  • Urology

Background:

  • Lifelong premature ejaculation is hypothesized to be a biological variation in intravaginal ejaculation latency.
  • The underlying causes of this variation remain poorly understood.

Purpose of the Study:

  • To investigate if ejaculation latency variations in a rat model are associated with differences in the spinal control of ejaculation.
  • To elucidate the neurophysiological mechanisms underlying ejaculation timing.

Main Methods:

  • Adult male Wistar rats were classified as 'sluggish,' 'normal,' or 'rapid' ejaculators based on mating tests.
  • Electrical microstimulation of the spinal ejaculation generator was used to evoke ejaculation in anesthetized rats.
  • Simultaneous measurement of bulbospongiosus muscle electromyography and vas deferens pressure assessed the expulsion and emission phases, respectively.

Main Results:

  • Electrical stimulation evoked ejaculation in all groups.
  • No significant differences in the emission phase (vas deferens contraction) were observed between groups.
  • The expulsion phase (bulbospongiosus muscle contraction) was significantly accelerated in 'rapid' ejaculators compared to 'sluggish' and 'normal' ejaculators.

Conclusions:

  • This study provides the first scientific evidence of neurophysiological differences between varying ejaculation speed groups.
  • An accelerated expulsion phase in 'rapid' ejaculators supports a link between sexual behavior and spinal ejaculation control.
  • Findings bridge the understanding of ejaculation latency as a trait and its neural underpinnings.