猫鼻腔区域的温觉感受器。
Warm receptors in the nasal region of cats.
作者信息
Hensel H, Kenshalo D R
出版信息
J Physiol. 1969 Sep;204(1):99-112. doi: 10.1113/jphysiol.1969.sp008901.
Abstract
- 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.
摘要
通过记录从眶下神经分离出的单个单位的传入冲动，对猫鼻区的特定温觉感受器进行了研究。此外，还检查了同一区域的一些冷觉纤维。
在鼻背部发现了许多具有点状感受野的温觉纤维。它们不会因机械刺激而兴奋。
为该区域服务的多纤维束对适度升温的反应是整合放电增加。
在30摄氏度及以上的恒定温度下，单个温觉纤维呈现稳定放电，冲动有规律地相继出现，其频率随温度急剧上升，在45至47摄氏度之间达到最大值。在更高温度下，频率降至零。
快速升温会导致动态超调，快速降温会使温觉纤维放电出现短暂抑制。单纤维的最高动态频率为200次/秒。
对于大量单个温觉纤维而言，在46摄氏度时静态活动的平均最大值为36次/秒，而冷觉纤维群体在27摄氏度时的最大值为9次/秒。
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