Manteuffel G, Naujoks-Manteuffel C
Institut für Zoologie, Technische Hochschule Darmstadt, Fed. Rep. Germany.
J Hirnforsch. 1987;28(6):625-32.
By means of retrograde horseradish peroxidase (HRP) transport, motoneurons innervating the musculus intertransversarius capitis superior (m.i.c.s.) of Salamandra salamandra (L.) were labeled from the level of the vagus nerve to the fourth spinal nerve. The bulk of the neurons was situated between the first and the third spinal nerve. The HRP-labelings revealed smaller cells with one apical dendrite and large cells with two main dendrites originating from opposite poles of the soma. With intracellular recordings from m.i.c.s. motoneurons a bimodal distribution of the antidromic latencies was found after intramuscular electrical stimulations. Optic inputs to the motoneurons were examined with electrical stimulation of the optic discs. It was shown that the majority of optic signals to the motoneurons originate from the contralateral eye. The latency distribution of these inputs suggests that most of the signals reach the motoneurons via indirect pathways involving at least one additional synapse. However, a few motoneurons seemed to be directly coupled with visual centers.
通过逆行辣根过氧化物酶（HRP）运输法，从迷走神经水平至第四脊髓神经对支配火蝾螈（Salamandra salamandra, L.）头横突间上肌（m.i.c.s.）的运动神经元进行标记。大部分神经元位于第一和第三脊髓神经之间。HRP标记显示，有较小的细胞带有一根顶树突，还有较大的细胞带有两根分别源自胞体相对两极的主要树突。通过对头横突间上肌运动神经元进行细胞内记录，发现在肌肉电刺激后，逆向潜伏期呈双峰分布。通过对视盘进行电刺激来检查运动神经元的视觉输入。结果表明，向运动神经元发送的大多数视觉信号源自对侧眼睛。这些输入的潜伏期分布表明，大多数信号通过至少涉及一个额外突触的间接途径到达运动神经元。然而，有少数运动神经元似乎与视觉中枢直接相连。
