Thermally induced salivary secretion in anesthetized rats

Teruo Nakayama*, Kazuyuki Kanosue, Hideto Tanaka, Tatsurou Kaminaga

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)


Effect of thermal stimulation on salivary secretion was examined in urethane anesthetized (i.p., 1.0 g/kg) rats. First, rectal temperature (Tre) was maintained at various levels by warming the whole trunk with a heating blanket. Copious salivary secretion occurred when Tre reached a threshold value above 40°C, which is considerably higher than the threshold for tail vasodilation. Local warming of the scrotum, face, or hypothalamus also elicited salivary secretion, but only if Tre was in a limited range just below the threshold temperature at which Tre alone would induce salivary secretion. The higher the Tre within that limited range, the lower the temperature of the site locally warmed at which salivary secretion began. Changes in temperature of the abdomen, not including the scrotum, modulated the salivary secretion elicited by scrotal warming. Hypothalamic and scrotal temperatures interacted with each other to affect salivary secretion. Temperature signals from both core and periphery thus appear to be integrated in bringing about salivary secretion. Thermally induced salivary secretion may function as a basis for saliva spreading behavior observed in rats in a hot environment.

Original languageEnglish
Pages (from-to)351-355
Number of pages5
JournalPflügers Archiv European Journal of Physiology
Issue number4
Publication statusPublished - 1986 Apr 1
Externally publishedYes


  • Abdominal temperature
  • Facial temperature
  • Hyperthermia
  • Hypothalamic temperature
  • Rat
  • Salivary secretion
  • Scrotal temperature

ASJC Scopus subject areas

  • Physiology
  • Clinical Biochemistry
  • Physiology (medical)


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