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Zoological Research
Kunming Institute of Zoology, Chinese Academy of Sciences
ISSN: 2095-8137
Vol. 31, No. 1, 2010, pp. 94−98
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Bioline Code: zr10014
Full paper language: Chinese
Document type: Research Article
Document available free of charge
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Zoological Research, Vol. 31, No. 1, 2010, pp. 94−98
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Effects of L-Glutamate Microinjection into the Ventral Horn of Spinal Cord Gray Matter on Gastrocnemius Contractility in Toad
Lu, Chang-Liang; Zhang, Xiao-Meng; Zhu, Jian-Ping & Ai, Hong-Bin
Abstract
A diagram of motor neuron pool of ventral horn of spinal cord gray matter in toad was first delineated.
Different concentrations (1,0.5,0.1,0.01 mol/L) of excitatory amino acid L-Glu or physiological saline (0.65% NaCl)
were then microinjected into the motor neuron pool in a urethane-anaesthetized toad. The contraction curve of the
gastrocnemius was then recorded by the BL-420 Physiological Signal Recording. We took the maximal tension, the
duration of rising phase, the velocity of tension variation, and the duration of descending phase as the parameters to study
the characteristic of gastrocnemius contractility. It was found that the gastrocnemius contractility of all the 4 groups was
tetanus but differed in degree, especially the maximal tension, and velocity of tension variation. In contrast to
physiological saline, gastrocnemius contracted by the stimulation of L-Glu, and the contraction parameter showed
dose-effect relationships except for the duration of descending phase, which was caused by the combination rate of L-Glu
and the receptor.
Keywords
Toad spinal cord; Ventral horn of gray matter; Motor neuron pool; L-Glu; Gastrocnemius; Contractility
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