THE GRADE REACTION OF THE VENTRAL ROOT REFLEX RESPONSE OF THE ISOLATED SPINAL CORD IN TOADS
- VernacularTitle:离体蟾蜍脊髓腹根反射的分级性反应
- Author:
Qiuwen FANG
- Publication Type:Journal Article
- Keywords:
toad spinal cord in vitro;
ventral root reflex response: grade reaction;
anode current block;
procaine block
- From:
Journal of Xi'an Jiaotong University(Medical Sciences)
1981;0(02):-
- CountryChina
- Language:Chinese
-
Abstract:
The ventral root reflex response (VRR) of the isolatcd spinal cord of the toad was observed by stimulating the sciatic nerve with various intensity. It was found that VRR was composed of an early phase and late Phase of dischage. To measure the area of dischagc with the integrator we found that it mainly reflected the change of the late phase, when the A?.? fibers in the sciatic nerve were excited, the area of VRR rea ehed 66% of the total area. When the A fibers were excited the area of VRR reach ed about 91% of the total area. Even though C fibers were excited with increasing, the intensity, the area of VRRwas not increased any more. This indicated that C fibers might not be involved in inducing VRR.After A?.? fibers were excited, the early phase of VRR had reached 96% of it's total amplitude. When the stimulus intensity was increased to be strong enough to excite A and C fibers, the amplitude of carly phase was not changed anymore indicating that A and C fibers are not relative to producing early phase of VRR,After A fibers were blocked by D-C current,the VRR disappeared immediately. When C fibers were blocked by Procaine, the VRR is not changed anymore, Showing that VRR is indueed only by A fibers.
