Marlot D, Macron J M, Duron B
Laboratoire de Neurophysiologie, Faculté de Médecine, Amiens, France.
Brain Res. 1988 May 31;450(1-2):373-7. doi: 10.1016/0006-8993(88)91578-8.
The phrenic-to-phrenic inhibitory reflex has been analyzed using recordings of activity of single C5-phrenic motor units (PMUs). After ipsilateral or contralateral stimulation of the C6-phrenic root, early and late PMUs exhibit a similar inhibition. After contralateral stimulation, the duration of the inhibition is smaller and the threshold stimulus is higher than the corresponding values observed after ipsilateral stimulation. The latency of the inhibition is similar for both stimulations. Hemispinalization, contralateral to the recording site, affects weakly the phrenic-to-phrenic reflex. We conclude that early and late PMUs receive a similar inhibitory input from phrenic afferents and that the inhibition observed after cervical phrenic nerve stimulation may involve spinal cord circuits.
膈神经对膈神经的抑制反射已通过记录单个C5膈神经运动单位（PMUs）的活动进行了分析。在同侧或对侧刺激C6膈神经根后，早期和晚期PMUs表现出相似的抑制作用。对侧刺激后，抑制持续时间较短，阈值刺激高于同侧刺激后观察到的相应值。两种刺激的抑制潜伏期相似。记录部位对侧的半脊髓化对膈神经对膈神经的反射影响较弱。我们得出结论，早期和晚期PMUs从膈神经传入获得相似的抑制性输入，并且在颈膈神经刺激后观察到的抑制可能涉及脊髓回路。
