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Related Experiment Videos

Micturition and the soul.

Gert Holstege1

  • 1Department of Anatomy and Embryology, University Medical Center Groningen, University of Groningen, 9713 AV Groningen, The Netherlands. g.holstege@med.umcg.nl

The Journal of Comparative Neurology
|October 29, 2005
PubMed
Summary
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The brainstem, particularly the periaqueductal gray (PAG) and pontine micturition center (PMC), controls urination by relaying signals from the bladder. This pathway is crucial for understanding and treating overactive bladder (OAB) and urge incontinence.

Area of Science:

  • Neuroscience
  • Urology
  • Animal Models

Background:

  • Micturition (urination) is closely linked to emotion and serves vital communication functions in many species.
  • The neural control of micturition is complex, involving brainstem structures connected to the limbic system.

Purpose of the Study:

  • To elucidate the supraspinal neural pathways controlling micturition, focusing on the brainstem.
  • To investigate the role of the periaqueductal gray (PAG) and pontine micturition center (PMC) in coordinating urination.

Main Methods:

  • Tracing of bladder afferent pathways in cats to identify neuronal projections.
  • Analysis of neuronal connections from the PAG to the PMC and downstream targets.
  • Review of human neuroimaging studies to compare with feline micturition control.

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Main Results:

  • Bladder afferents project to the lateral dorsal horn and intermediate zone, then to the central periaqueductal gray (PAG).
  • The lateral PAG projects to the pontine micturition center (PMC), which directly controls bladder contraction and sphincter relaxation.
  • The preoptic area, caudal hypothalamus, and ventromedial upper medullary tegmentum also project to the PMC.

Conclusions:

  • The PAG acts as a key relay station for brain structures influencing micturition, projecting to the PMC.
  • The feline micturition control pathway, involving the PAG-PMC axis, appears conserved in humans.
  • Understanding this neural circuitry is essential for developing treatments for overactive bladder (OAB) and urge incontinence.