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Related Experiment Videos

Remote electrodermic response to an algogenic stimulus. Pathway and spinal integration.

J Ferré1, L M Gonzalo-Sanz

  • 1Departamento de Anatomía, Facultad de Medicina, Universidad de Navarra, Pamplona, Spain.

Revista Espanola De Fisiologia
|December 1, 1987
PubMed
Summary

This study reveals the neural pathway for a non-segmental sudomotor reflex in rabbits. Thermal foot stimulation triggers a sweat response in the ear, detailing the reflex

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Area of Science:

  • Neuroscience
  • Physiology

Background:

  • Non-segmental sudomotor reflexes are not well understood.
  • The podo-auricular reflex, linking foot stimulation to ear sweating, presents a unique model for study.

Purpose of the Study:

  • To elucidate the afferent and efferent neural pathways of the non-segmental sudomotor reflex in rabbits.
  • To determine the spinal cord segments involved in the podo-auricular sudomotor reflex.

Main Methods:

  • Thermic stimulation of the rabbit foot (45°C for 30s) to evoke a sudoral response in the ear.
  • Sequential nerve sections and spinal cord transections at various levels (L4, T6, C6) to map reflex pathways.

Main Results:

  • Identified afferent pathways: lateral plantar nerve, tibial nerve, saphenous and femoral perivascular networks, and femoral nerve.

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  • Demonstrated that the reflex pathway enters the spinal cord above L4 and is ipsilateral, with efferent fibers exiting below C6.
  • Confirmed that sudomotor impulses travel with auricular vessels to reach pinna sweat glands.

    • Conclusions:

    • The podo-auricular sudomotor reflex involves a complex, non-segmental pathway.
    • The study precisely maps the central and peripheral neural circuitry governing this reflex in rabbits.