Hammar I, Läckberg Z S, Jankowska E
Department of Physiology, University of Göteborg, Sweden.
Exp Brain Res. 1994;100(1):1-6. doi: 10.1007/BF00227273.
Peripheral input to spino-cervical tract (SCT) neurons located in the L4 and L5 segments of the cat spinal cord was investigated using both extracellular and intracellular recording. The main aim was to find out whether midlumbar SCT neurons are excited monosynaptically not only by cutaneous afferents but also by group II muscle afferents, as in the sacral segments but apparently not in the caudal lumbar segments. Input from group II muscle afferents was found in 73% of investigated neurons; the latencies of excitation by group II afferents were compatible with a monosynaptic coupling between these afferents and 62% of neurons. The majority of the midlumbar SCT neurons were excited by group II afferents of the quadriceps and deep peroneal nerves. The predominant monosynaptic input from cutaneous afferents to the same neurons was from the saphenous nerve.
利用细胞外和细胞内记录技术，对位于猫脊髓L4和L5节段的脊髓-颈髓束（SCT）神经元的外周输入进行了研究。主要目的是弄清楚腰中部的SCT神经元是否不仅像在骶节段那样受到皮肤传入神经的单突触兴奋，而且还受到II类肌肉传入神经的单突触兴奋，而在腰尾段显然并非如此。在73%的被研究神经元中发现了来自II类肌肉传入神经的输入；II类传入神经兴奋的潜伏期与这些传入神经和62%的神经元之间的单突触耦合相一致。大多数腰中部SCT神经元受到股四头肌和腓深神经的II类传入神经的兴奋。来自皮肤传入神经对同一神经元的主要单突触输入来自隐神经。
