REFLEX ACTION OF MUSCLE CONTRACTION

运动的瞬间控制取决于 下行命令的脊髓和活动， 脊髓反射通路 虽然肌肉的反射动作 拉伸已被广泛研究，但对拉伸所知甚少。 肌肉拉伸反射作用已经被广泛地 研究，更少的是了解肌肉的反射作用 收缩。 特别是，在这方面的工作很少。 反射效应的神经机制和功能作用 从收缩的肌肉到其他肌肉。 的 研究的目的是提供一个定量的 分析这些收缩诱发反射， 它们的传入和神经元间机制。 这个总目标 可分为三个具体目标： 1. 描述肌肉产生的反射效应模式 去大脑猫的收缩（有或没有额外的 部分脊柱切片）。 等长收缩产生的反射效应 收缩（通过腹根刺激），拉伸，振动和 肌肉神经的电刺激将与 不同类型的肌肉传入的反应，以确定 这些影响的来源。 2. 描述第1组和强制激活的反应 中间神经元对肌肉收缩、伸展、振动和神经 刺激. 反射效应的定量比较， 传入和中间神经元反应将用于识别那些 interneurons最有可能调解contractionevoked反射. 3. 要确定组1和组2的特定输出连接， 通过尖峰触发的平均， 神经元放电进入肌电图活动， 伸肌。

The momenttomoment control of movement depends both upon the descending commands to the spinal cord and on activity in spinal reflex pathways. Although the reflex actions of muscle stretch have been extensively studied, much less is known about the reflex actions of muscle stretch have been extensively studied, much less in known about the reflex actions of muscle contraction. In particular, there has been very little work on the neuronal mechanisms and functional role of reflex effects directed from the contracting muscle to other muscles. The purpose of the proposed research is to provide a quantitative analysis of these contractionevoked reflexes and to investigate their afferent and interneuronal mechanisms. This general goal can be divided into 3 specific aims: 1. To describe the pattern of reflex effects produced by muscle contraction in the decerebrate cat (with or without an additional partial spinal section). Reflex effects produced by isometric contractions (via ventral root stimulation), stretch, vibration and electrical stimulation of muscle nerves will be compared with the responses of different types of muscle afferents to determine the afferent source of these effects. 2. To describe the response of Group 1 and force activated interneurons to muscle contraction, stretch, vibration and nerve stimulation. Quantitative comparisons of reflex effects with afferent and interneuron response will be used to identify those interneurons most likely to mediate contractionevoked reflexes. 3. To determine the specific output connections of Group 1 and force activated interneurons by spiketriggered averaging from neuron discharge into electomyographic activity in various extensor muscles.