Wada N, Sugita S, Hirao A, Tokuriki M
Department of Veterinary Physiology, Faculty of Agriculture, Yamaguchi University, Japan.
Arch Ital Biol. 1995 Jul;133(3):211-6.
Postsynaptic potentials (PSPs) were recorded in 57 extensor caudae lateralis (ECL) motoneurons and 82 flexor caudae longus (FCL) motoneurons of 36 decerebrated and spinalized (L1-2) adult cats, upon electrical stimulation of hindlimb cutaneous nerves, such as the sural nerve, superior peroneus nerve, and plantar section of the tibial nerve. With low threshold stimulation (1.2-5.0 T), excitatory PSPs (EPSP, EPSP/IPSP) predominated in ECL and FCL motoneurons. In a few ECL and FCL motoneurons, however, inhibitory PSPs were observed. Increasing the stimulus intensity from 1.2 T to 5.0 T led to an increase in amplitude of the PSPs. The central latencies of the PSPs were distributed over a wide range and minimal latencies of PSPs corresponded to 3.5 and 3.8 ms in ECL and FCL motoneurons, respectively. The measurement of central latencies reveals the oligo- and polysynaptic neural pathways from hindlimb cutaneous nerves to tail muscle motoneurons.
在36只去大脑和脊髓（L1-2）的成年猫中，对57个尾外侧伸肌（ECL）运动神经元和82个尾长屈肌（FCL）运动神经元进行了突触后电位（PSP）记录，刺激后肢皮神经，如腓肠神经、腓总上神经和胫神经足底支。在低阈值刺激（1.2 - 5.0 T）下，ECL和FCL运动神经元中兴奋性PSP（EPSP，EPSP/IPSP）占主导。然而，在少数ECL和FCL运动神经元中观察到抑制性PSP。将刺激强度从1.2 T增加到5.0 T导致PSP幅度增加。PSP的中枢潜伏期分布范围很广，ECL和FCL运动神经元中PSP的最短潜伏期分别为3.5和3.8毫秒。中枢潜伏期的测量揭示了从后肢皮神经到尾肌运动神经元的单突触和多突触神经通路。
