反射放电的脊髓和脊髓上部分传入腰段和胸段白交通支。

Spinal and supraspinal components of the reflex discharges into lumbar and thoracic white rami.

作者信息

Sato A, Schmidt R F

出版信息

J Physiol. 1971 Feb;212(3):839-50. doi: 10.1113/jphysiol.1971.sp009359.

DOI:10.1113/jphysiol.1971.sp009359

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC1395725/

Abstract

In chloralose anaesthetized cats reflex discharges in thoracic and lumbar white rami were elicited by single shock stimulation of intercostal, spinal and hind limb nerves.2. In animals with an intact neuraxis single stimuli of sufficient strength usually elicited a white rami mass discharge having two distinct components. Following spinal transection only the late reflex component disappeared.3. The early (spinal) reflex component had its largest amplitude if the afferent volley entered the spinal cord at the same or an adjacent segment of the white ramus under observation, whereas the size of the late (supraspinal) component was rather independent of the segmental level of the afferent input.4. It was concluded that somatic afferent volleys have a twofold action on the sympathetic nervous system: a more generalized action via the supraspinal sympathetic reflex centres and a more circumscribed action on the preganglionic neurones at the segmental level.

摘要

在水合氯醛麻醉的猫中，通过对肋间神经、脊神经和后肢神经进行单次电刺激，诱发胸段和腰段白交通支的反射放电。
在神经轴完整的动物中，强度足够的单次刺激通常会诱发白交通支的大量放电，该放电有两个不同的成分。脊髓横断后，只有晚期反射成分消失。
如果传入冲动在观察的白交通支的同一节段或相邻节段进入脊髓，早期（脊髓）反射成分的振幅最大，而晚期（脊髓以上）成分的大小与传入输入的节段水平相当无关。
得出的结论是，躯体传入冲动对交感神经系统有双重作用：通过脊髓以上的交感反射中枢产生更广泛的作用，以及在节段水平对节前神经元产生更局限的作用。