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  • Title: Warm receptors in the nasal region of cats.
    Author: Hensel H, Kenshalo DR.
    Journal: J Physiol; 1969 Sep; 204(1):99-112. PubMed ID: 5352076.
    Abstract:
    1. Specific warm receptors in the nasal region of cats were studied by recording afferent impulses from single units dissected from the infraorbital nerve. In addition, a few cold fibres from the same region were examined.2. Numerous warm fibres with spot-like receptive fields were found on the back of the nose. They were not excited by mechanical stimulation.3. Multi-fibre strands serving this area responded to moderate warming with an increase of the integrated discharge.4. At constant temperatures from 30 degrees C on, single warm fibres showed a steady discharge with a regular sequence of impulses, the frequency of which rose steeply with temperature and reached a maximum between 45 and 47 degrees C. At higher temperatures the frequency fell to zero.5. Rapid warming caused a dynamic overshoot, rapid cooling a transient inhibition of the warm fibre discharge. The highest dynamic frequencies of single fibres were 200 impulses/sec.6. For a large population of single warm fibres the average maximum of static activity was 36 impulses/sec at 46 degrees C, whereas the cold fibre population had a maximum of 9 impulses/sec at 27 degrees C.
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