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Normal vestibular function in chicks after partial exposure to microgravity during development

R V Kenyon1, R Kerschmann, R Sgarioto

  • 1University of Illinois at Chicago, Department of Electrical Engineering and Computer Science 60607, USA.

Journal of Vestibular Research : Equilibrium & Orientation
|July 1, 1995
PubMed
Summary
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Chicken embryos exposed to microgravity showed no significant vestibular system differences. Day 2 embryos did not survive, while Day 9 embryos appeared viable, suggesting a critical developmental window for microgravity effects.

Area of Science:

  • Space biology
  • Developmental biology
  • Neuroscience

Background:

  • The vestibular system's development and function are sensitive to gravitational forces.
  • Understanding microgravity's impact on embryonic development is crucial for space exploration.

Purpose of the Study:

  • To investigate the effects of microgravity on the developing vestibular system of chicken embryos.
  • To assess morphological and behavioral changes in response to spaceflight.

Main Methods:

  • Fertilized chicken eggs (Day 2 and Day 9) were exposed to microgravity for 5 days.
  • Postflight, embryos were examined for survival, and temporal bones were analyzed using scanning electron microscopy.
  • Hatched chicks underwent behavioral reflex tests and movement recordings.

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Main Results:

  • Day 2 embryos did not survive spaceflight; Day 9 embryos and ground controls appeared viable.
  • No consistent morphological differences in lagenar otoconia were observed between flight and control groups.
  • Behavioral studies revealed no significant differences in reflexes or head movements.

Conclusions:

  • Microgravity exposure did not induce observable morphological or behavioral changes in Day 9 chicken embryos.
  • Early developmental stages (Day 2) may be more sensitive to microgravity, leading to non-survival.
  • Potential masking effects from re-adaptation to Earth's gravity or developmental stage may explain the lack of observed differences.