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Unilateral naris closure and olfactory system development

P C Brunjes1

  • 1University of Virginia, Charlottesville 22903.

Brain Research. Brain Research Reviews
|January 1, 1994
PubMed
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Closing one nostril in newborn rats significantly reduces olfactory bulb size by adulthood. This study explores the anatomical, biochemical, and physiological changes causing this growth regulation.

Area of Science:

  • Neuroscience
  • Developmental Biology
  • Olfactory System Research

Background:

  • Bilateral odorant access to the olfactory sensory epithelium is typical in animals.
  • The olfactory bulb, an extension of the telencephalon, receives input from olfactory sensory cells.
  • Early postnatal sensory experience is crucial for neural development.

Purpose of the Study:

  • To investigate the regulation of early olfactory bulb growth.
  • To understand the anatomical, biochemical, and physiological changes following naris occlusion.
  • To establish a framework for further research into sensory-driven neural development.

Main Methods:

  • Surgical occlusion of a single external naris in rat pups on postnatal day 1 (P1).
  • Examination of olfactory bulb size and structure on postnatal day 30 (P30).

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  • Review of existing literature on anatomical, biochemical, and physiological changes.

    • Main Results:

    • Unilateral naris occlusion resulted in a ~25% reduction in the ipsilateral olfactory bulb size by P30.
    • Initial equality in olfactory bulb size was disrupted, showing a significant discrepancy after occlusion.
    • The olfactory system's clear lamination supports its use in studying growth regulation.

    Conclusions:

    • Naris occlusion is an effective model for studying the regulation of early olfactory bulb growth.
    • Sensory deprivation significantly impacts olfactory bulb development.
    • Further research is needed to elucidate the specific mechanisms driving these developmental changes.