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Lateralization of bladder function in normal female canines.

Dania Giaddui1, Danielle S Porreca1, Ekta Tiwari1

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Summary

Female dog bladders show functional lateralization, meaning innervation is not perfectly symmetrical. This bladder function asymmetry was observed consistently across different stimulation methods and thresholds.

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Area of Science:

  • Urology
  • Neuroscience
  • Comparative Anatomy

Background:

  • Understanding bladder innervation is crucial for diagnosing and treating lower urinary tract disorders.
  • Previous research has explored bladder function, but the degree of hemispheric control remains an area of investigation.

Purpose of the Study:

  • To investigate potential lateralization of bladder function in female dogs.
  • To determine if bladder innervation exhibits a dominant side (left or right) or is bilateral.

Main Methods:

  • Bilateral electrical stimulation of spinal roots and the pelvic nerve's anterior vesical branch in female dogs.
  • Quantification of detrusor pressure changes to assess functional differences between left and right bladder responses.
  • Analysis of data using 25% and 10% difference thresholds to define lateralization.

Main Results:

  • Significant evidence of bladder lateralization was found, with left- and right-sided dominance occurring at similar rates.
  • Stimulation of spinal roots showed left-sided lateralization in 38.6% and right-sided in 27.2% (25% threshold).
  • Pelvic nerve stimulation also indicated similar rates of left (42.1%) and right (31.6%) sidedness (25% threshold), with variations noted across spinal cord levels.

Conclusions:

  • The female dog bladder exhibits functional lateralization of innervation.
  • This asymmetry in bladder control suggests a complex neural organization rather than complete bilateral symmetry.
  • Findings contribute to understanding the neuroanatomy and functional control of the lower urinary tract.