Czéh G, T-Dezsö G
Acta Physiol Acad Sci Hung. 1981;58(4):285-97.
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.
在1-3摄氏度体温下，对食用蛙坐骨神经冲动诱发的运动神经元反应的反复抑制进行了研究。记录了腹根轴突的总体记录和运动神经元的细胞内记录。与之前在室温下使用相同技术从同一物种获得的数据一致，反复刺激在低温下也会抑制运动神经元对坐骨神经冲动的反应。随着冷却，抑制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期成分受影响更大。在细胞内，通过运动神经元突触后放电的延迟或阻断以及兴奋性突触后电位的减小表明存在抑制。这些数据被视为变温动物中枢神经系统在接近0摄氏度的温度下简单多突触通路运作的证据。相互作用的特性与在较高温度下发现的特性一致，并随着冷却而发生预期的变化。
