低温条件下青蛙运动神经元突触后反应的反复抑制。

G Czéh, G T-Dezsö
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引用次数: 0

摘要

研究了在1 ~ 3℃体温条件下,坐骨神经截击引起的运动神经元反应的反复抑制。腹根轴突的大体记录和运动神经元的细胞内记录。与先前在室温下使用相同技术从同一物种获得的数据一致,在低温下,反复的截击也抑制了运动神经元对坐骨神经冲动的反应。随着降温,抑郁的潜伏期和持续时间增加了约两倍。诱发反应的短潜伏期成分比晚潜伏期成分受到的影响更大。胞内表现为突触后放电延迟或阻滞,运动神经元epsp减少。这些数据被认为是在接近0摄氏度的温度下,变温动物中枢神经系统中存在简单多突触通路的证据。这些相互作用的性质与在较高温度下发现的性质一致,并且随着冷却而发生预期的改变。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Recurrent depression of postsynaptic responses in the frog motoneurons at low temperature.

Recurrent depression of responses evoked in motoneurons by sciatic nerve volleys was studied at 1-3 degrees C body temperature in Rana esculenta. Gross recordings from the ventral root axons and intracellular recordings from the motoneurons were made. In accord previous data obtained from the same species using the same techniques at room temperature, recurrent volleys depressed the responses of motoneurons to sciatic nerve impulses also at low temperature. The latency and duration of the depression was increased by a factor of about two with cooling. The short latency components of the evoked responses suffered more than the late ones. Intracellularly was indicated depression by delay or blockage of postsynaptic discharge and diminution of epsp in motoneurons. The data are considered as evidence for the operation of simple polysynaptic pathways in the central nervous system of poikilothermic animals at temperatures near 0 degrees C. Properties of the interaction are in accord with those found at higher temperature and undergo the expected modifications with cooling.

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