Duffin J, Douse M A, van Alphen J
Department of Physiology, University of Toronto, Ontario, Canada.
Neuroreport. 1994 May 9;5(9):1133-6. doi: 10.1097/00001756-199405000-00028.
The responses of 57 upper cervical inspiratory neurones to single shock stimuli applied to the ipsilateral cervical vagus nerve were recorded using peri-stimulus histograms in 19 cats. Many (47%) of the histograms showed a late latency (17.9 +/- 3.4 ms; mean +/- S.D.) broad peak following the stimulation preceding a similar peak in the histogram for the phrenic activity. Nine (16%) showed a short latency (5.2 +/- 1.2 ms) peak preceding that for the phrenic activity. These peaks were of narrow half-amplitude width (1.0 +/- 0.4 ms), indicative of a paucisynaptic pathway between the cervical vagus and the ipsilateral upper cervical inspiratory neurones. Such results suggest that the upper cervical inspiratory neurones are either monosynaptically excited via vagal fibres, or disynaptically excited via dorsal group inspiratory neurones.
在19只猫中，使用刺激周围直方图记录了57个颈上吸气神经元对施加于同侧颈迷走神经的单次电击刺激的反应。许多（47%）直方图显示，在膈神经活动直方图出现类似峰值之前，刺激后有一个延迟较晚（17.9±3.4毫秒；平均值±标准差）的宽峰。9个（16%）显示在膈神经活动峰值之前有一个延迟较短（5.2±1.2毫秒）的峰。这些峰的半幅度宽度较窄（1.0±0.4毫秒），表明颈迷走神经与同侧颈上吸气神经元之间存在少突触通路。这些结果表明，颈上吸气神经元要么通过迷走神经纤维单突触兴奋，要么通过背侧组吸气神经元双突触兴奋。
