Cahusac Peter M B, Senok Solomon
Department of Psychology, Stirling University, Stirling FK9 4LA, Scotland, UK; College of Medicine, Alfaisal University, PO Box 50927, Riyadh 11533, Saudi Arabia; Department of Comparative Medicine, King Faisal Specialist Hospital & Research Centre, Riyadh, Saudi Arabia.
Department of Psychology, Stirling University, Stirling FK9 4LA, Scotland, UK; Ajman University School of Medicine, PO Box 346, Ajman, UAE.
Int J Dev Neurosci. 2018 Aug;68:35-38. doi: 10.1016/j.ijdevneu.2018.04.001. Epub 2018 Apr 10.
Merkel nerve endings are identified physiologically as slowly adapting type I mechanoreceptor units. They are important for fine acuity tactile perception. We examined the effect of age on the electrophysiological availability of different types of slowly adapting mechanoreceptor units. Using 6-50 week old rats, we observed an obvious decline with age in the probability of recording from St I units of the deep vibrissal nerve. The precipitous decline occurred between ages 6-14 weeks and then stabilized. By contrast, the prevalence of St II units, the other type of slowly adapting mechanoreceptor, remained constant over the age range studied. These observations correlate with anatomical findings reported elsewhere.
默克尔神经末梢在生理上被识别为慢适应性I型机械感受器单位。它们对于敏锐的触觉感知很重要。我们研究了年龄对不同类型慢适应性机械感受器单位电生理可用性的影响。使用6至50周龄的大鼠，我们观察到随着年龄的增长，从深部触须神经的St I单位记录的概率明显下降。这种急剧下降发生在6至14周龄之间，然后趋于稳定。相比之下，另一种慢适应性机械感受器St II单位的患病率在所研究的年龄范围内保持不变。这些观察结果与其他地方报道的解剖学发现相关。
