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Related Experiment Videos

Hypothalamic region facilitating shivering in rats.

M Tanaka1, M Tonouchi, T Hosono

  • 1Department of Physiology, School of Allied Health Sciences, Osaka University Faculty of Medicine, Suita, 565-0871 Japan.

The Japanese Journal of Physiology
|December 6, 2001
PubMed
Summary

Neurons in the medial hypothalamus regulate shivering. This study found that inhibiting these neurons with muscimol suppressed cold-induced shivering in rats, identifying key thermoregulatory pathways.

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Area of Science:

  • Neuroscience
  • Physiology
  • Thermoregulation

Background:

  • The posterior hypothalamus is traditionally linked to thermoregulatory shivering.
  • The precise neural circuits and cell types involved remain unclear.

Purpose of the Study:

  • To investigate the role of hypothalamic neurons in cold-induced shivering.
  • To determine if specific neuronal populations within the medial hypothalamus are essential for shivering.

Main Methods:

  • Urethane-anesthetized rats were exposed to cold (15-21°C) to induce shivering.
  • Muscimol, a GABA(A) receptor agonist, was injected into the medial hypothalamus, targeting dorsomedial and posterior nuclei.

Main Results:

  • Cold exposure successfully elicited shivering in rats.

Related Experiment Videos

  • Injection of muscimol into the medial hypothalamus significantly suppressed cold-induced shivering.

    • Conclusions:

    • Neurons located in the medial hypothalamus, specifically the dorsomedial and posterior nuclei, play a crucial role in initiating and maintaining shivering.
    • These findings suggest the presence of excitatory neurons within this hypothalamic region that drive the shivering thermoregulatory response.