| Brain stem tonic inhibition of thermoregulation in the rat. | |
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MedLine Citation:
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PMID: 6742225 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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It was shown, by selective levels of decerebration, that a drop in body temperature occurred in a midpontine rat due to impairment in thermoregulatory responses. Lowering the level of decerebration to the lower pons restored a coordinated thermoregulatory response. The response was inadequate to raise the core temperature to normal level, but it was nevertheless an integrated response of vasoconstriction, piloerection, and shivering and was appropriately turned off by warming the skin or core. In intact unanesthetized rats, microinjection of a local anesthetic in the pontine tegmentum resulted in thermoregulatory responses, such as curling of the body, piloerection, tremor in facial muscles, and shivering. Similar injections in the pontine tegmentum of the midpontine decerebrate rat also restored some heat gain responses, including shivering. These experiments suggest that in rats the heat gain responses are powerfully regulated by a tonic inhibitory mechanism located in the midbrain and upper pons that exerts a complete inhibitory effect on the thermoregulatory areas caudal to the midbrain in decerebrate rats and a partial inhibitory effect in intact animals. These experiments also confirm the previous observation in the cat of the presence of a facilitatory area(s) in lower levels of the central nervous system which is responsible for coordinated heat gain responses observed in low-level decerebrate animals. In addition, these experiments suggest that the brain stem thermoregulatory mechanisms are in fact functioning in intact unanesthetized animals. |
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Authors:
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L Amini-Sereshki; M R Zarrindast |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: The American journal of physiology Volume: 247 ISSN: 0002-9513 ISO Abbreviation: Am. J. Physiol. Publication Date: 1984 Jul |
Date Detail:
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Created Date: 1984-08-17 Completed Date: 1984-08-17 Revised Date: 2008-11-21 |
Medline Journal Info:
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Nlm Unique ID: 0370511 Medline TA: Am J Physiol Country: UNITED STATES |
Other Details:
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Languages: eng Pagination: R154-9 Citation Subset: IM |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Animals Body Temperature Regulation* / drug effects Brain Stem / drug effects, physiology* Cold Temperature Consciousness Decerebrate State / physiopathology Male Piloerection Pons / physiology Procaine / pharmacology Rats Reticular Formation / physiology Shivering Vasoconstriction |
| Chemical | |
Reg. No./Substance:
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59-46-1/Procaine |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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