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Related Experiment Videos

Hypothalamic network for thermoregulatory vasomotor control

K Kanosue1, M Yanase-Fujiwara, T Hosono

  • 1Department of Physiology, Osaka University Medical School, Japan.

The American Journal of Physiology
|July 1, 1994
PubMed
Summary
This summary is machine-generated.

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Thermoregulatory signals controlling skin blood vessel dilation cross the midline within and below the rat

Area of Science:

  • Neuroscience
  • Physiology
  • Thermoregulation

Background:

  • The preoptic area and anterior hypothalamus (POAH) regulate body temperature.
  • Unilateral warming of the POAH induces bilateral skin vasodilation.

Purpose of the Study:

  • To investigate the pathways for thermoregulatory vasodilation signals crossing the midline within and below the POAH.
  • To determine if efferent signals controlling vasodilation descend through the medial forebrain bundle.

Main Methods:

  • Rats underwent either midsagittal or coronal transection of the hypothalamus.
  • Unilateral thermal or electrical stimulation of the POAH was applied.
  • Hind paw vasomotion was measured to assess vasodilation.

Main Results:

Related Experiment Videos

  • Unilateral POAH stimulation caused bilateral paw vasodilation in both transected groups.
  • Signal crossing occurred both within and below the POAH.
  • The medial forebrain bundle appears to be a key pathway for these signals.

Conclusions:

  • Thermoregulatory information for vasodilation crosses the midline both within and below the POAH.
  • Efferent signals through the medial forebrain bundle have stronger ipsilateral innervation to skin blood vessels.