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Brain lesions affect penile reflexes

E P Monaghan1, J Arjomand, S M Breedlove

  • 1Psychology Department, University of California, Berkeley 94720.

Hormones and Behavior
|March 1, 1993
PubMed
Summary
This summary is machine-generated.

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Brain regions projecting to the spinal nucleus of the bulbocavernosus (SNB) modulate rat penile reflexes. Lesions in specific areas like the median raphe potentiate or alter reflex expression, impacting sexual behavior.

Area of Science:

  • Neuroscience
  • Neurobiology
  • Behavioral Neuroscience

Background:

  • The spinal nucleus of the bulbocavernosus (SNB) plays a crucial role in regulating penile reflexes.
  • Understanding the central nervous system's influence on sexual reflexes is vital for comprehending reproductive behaviors.

Purpose of the Study:

  • To investigate the role of specific brain afferents projecting to the SNB in modulating penile reflex activity.
  • To determine how lesions in key brain areas affect the expression and characteristics of penile reflexes in rats.

Main Methods:

  • Electrolytic lesions were induced in various brain regions known to project to the SNB.
  • Penile reflex behaviors (e.g., cups, flips, erections) were observed and measured in lesioned and control rats.
  • Latency to reflex initiation and overall reflex expression were quantified.

Related Experiment Videos

Main Results:

  • Ablation of median and pontine raphe areas significantly potentiated penile reflexes (cups and flips).
  • Bilateral lesions of the paraventricular nucleus of the hypothalamus reduced erection latency but did not otherwise impair reflexes.
  • Bilateral destruction of the lateral vestibular nucleus (LVN) abolished penile reflexes but also caused motor deficits.

Conclusions:

  • Specific brain regions projecting to the SNB, including the median raphe and paraventricular nucleus, modulate spinal reflex behavior of the rat penis.
  • The lateral vestibular nucleus's role in penile reflexes is unclear due to confounding motor impairments.
  • These findings support the hypothesis that descending pathways to the SNB regulate penile reflex expression.