Rapuzzi G, Villa Balduini A, Gilberti Vitali G
Boll Soc Ital Biol Sper. 1981 Dec 30;57(24):2451-7.
In the previous papers we have reported that the innervation of the frog lingual mucosa exercises a presynaptic inhibition at the bulbar region in order to integrate the mechanoreceptive information coming from the tongue. The present investigation was undertaken to establish if also the complementary tactile innervation of fungiform papillae has a similar ability. First of all it has been assayed the evocation of PAD tests by papillary innervation; then the facilitating effects, induced by the glossopharyngeal axotomy, on the afferents mass discharges recorded from hypoglossal nerve have been examined. Electrical stimulation of mechanical neurons at the root of IX produced DRP and DRR both at glossopharyngeal and hypoglossal nerves. After 5 and 10 days from glossopharyngeal axotomy becomes evident a considerable enhancement of efferent responses in many diastaltic arches of bulb. These effects strongly suggest a very evident inhibitory activity at the bulbar projection of papillary innervation. From all these observations it follows that presynaptic inhibition is joint to all the lingual mechanoreceptive afferences.
在之前的论文中我们报道过，蛙舌黏膜的神经支配在延髓区域发挥突触前抑制作用，以便整合来自舌头的机械感受信息。本研究旨在确定菌状乳头的互补性触觉神经支配是否也具有类似能力。首先，已通过乳头神经支配测定了PAD试验的诱发情况；然后，研究了舌咽神经切断术对舌下神经记录的传入冲动群放电的促进作用。在舌咽神经根部对机械感受神经元进行电刺激，在舌咽神经和舌下神经均产生了背根电位（DRP）和背根反应（DRR）。舌咽神经切断术后5天和10天，延髓许多菱形弓的传出反应明显增强。这些效应强烈表明，在乳头神经支配的延髓投射处存在非常明显的抑制活性。从所有这些观察结果可以得出结论，突触前抑制与所有舌部机械感受传入相关。
