膝关节传入放电对去大脑猫屈肌反射通路传导的影响。
The effect of knee joint afferent discharge on transmission in flexion reflex pathways in decerebrate cats.
作者信息
Baxendale R H, Ferrell W R
出版信息
J Physiol. 1981 Jun;315:231-42. doi: 10.1113/jphysiol.1981.sp013744.
Abstract
- Changes in excitability of reflex arcs mediating flexion withdrawal ad crossed extensor reflexes have been examined in decerebrate cats. 2. The excitability of flexion withdrawal and crossed extensor reflexes was shown to be modulated by knee joint position. Flexion withdrawal reflexes were most easily elicited when the knee was extended and crossed extensor reflexes were most easily elicited when the knee was flexed. 3. The modulation of transmission was not confined to reflex pathways to muscles acting at the knee but also included pathways to muscles acting at the hip and ankle, as well as pathways to muscles in the contralateral limb. 4. The changing excitability of reflex pathways caused by movement of the knee joint was unrelated to the stretch applied to muscles acting at the knee and to cutaneous afferent discharge. Modulation of reflex excitability by joint movement was totally abolished by local anaesthesia of the knee joint in an otherwise intact limb. 5. The results of the present experiments indicate that transmission in flexion reflex pathways can be inhibited by knee joint afferent discharge.
摘要
- 已在去大脑猫中研究了介导屈肌反射和交叉伸肌反射的反射弧兴奋性的变化。2. 结果表明，屈肌反射和交叉伸肌反射的兴奋性受膝关节位置的调节。膝关节伸展时，屈肌反射最易引出；膝关节屈曲时，交叉伸肌反射最易引出。3. 这种传递调制不仅限于作用于膝关节的肌肉的反射通路，还包括作用于髋关节和踝关节的肌肉的通路，以及对侧肢体肌肉的通路。4. 膝关节运动引起的反射通路兴奋性变化与作用于膝关节的肌肉所受的牵张以及皮肤传入放电无关。在其他方面完好的肢体中，通过膝关节局部麻醉可完全消除关节运动对反射兴奋性的调制。5. 本实验结果表明，膝关节传入放电可抑制屈肌反射通路中的传递。
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