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首页> 外文期刊>Journal of Neurophysiology >Contraction-induced excitation in cat peroneal motoneurons.
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Contraction-induced excitation in cat peroneal motoneurons.

机译：收缩诱发猫腓神经运动神经元的兴奋。

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摘要

1. Motoneurons innervating peroneal muscles were recorded intracellularly in anesthetized cats during sustained submaximal isometric contractions of peroneus brevis produced by repetitive electrical stimulation of motor axons in the distal portion of cut ventral root filaments. 2. In contrast with the inhibition previously observed during contractions of gastrocnemius medialis muscle in triceps surae motoneurons, the afferent input generated by peroneus brevis contraction elicited excitatory potentials in nearly all motoneurons supplying peroneus brevis, peroneus tertius, or peroneus longus muscles. 3. We ascribed the contraction-induced excitation of peroneal motoneurons to spindle afferents for two reasons. First, the amplitude of contraction-induced excitatory potentials increased when the ventral root stimulation strength was increased to recruit gamma-axons. Second, with stimulation strengths under gamma-threshold, peroneus brevis contraction still excited peroneal motoneurons, and we obtained evidence that activation of spindles by skeletofusimotor beta-axons could account at least partly for this excitation. 4. The lack of contraction-induced inhibition in peroneal motoneurons and the prevalence of contraction-induced excitation raised the possibility that, in contrast to the usual effects of tendon organ afferents, Ib afferents from peroneus brevis might exert an excitatory influence on homonymous motoneurons. The fact that electrical stimulation of group I afferents in the nerve to peroneus brevis only exceptionally evoked inhibition in peroneal motoneurons would appear compatible with this hypothesis. Furthermore, stimulation of cutaneous afferents, known to facilitate transmission in Ib pathways, only exceptionally revealed a weak contraction-induced inhibition.(ABSTRACT TRUNCATED AT 250 WORDS)
机译：1.在重复切割的腹侧根细丝远端，通过运动性轴突的持续电刺激产生的腓骨短短持续等长收缩期间，麻醉的猫的胞内记录了支配腓肠肌的动子神经元。 2.与先前在肱三头肌运动神经元腓肠肌内侧肌肉收缩过程中观察到的抑制作用相反，腓骨短肌收缩产生的传入输入几乎在所有供应腓骨短肌，腓骨叔肌或腓骨长肌的运动神经元中引起兴奋性电位。 3.我们归因于腓肠运动神经元收缩诱导的兴奋到纺锤传入，这有两个原因。首先，当腹侧根刺激强度增加以募集伽玛轴突时，收缩诱导的兴奋电位的幅度增加。其次，在伽玛阈值以下的刺激强度下，腓骨短肌收缩仍然会刺激腓骨运动神经元，并且我们获得了证据，表明由骨架融合运动性β轴突激活的纺锤至少可以部分解释这种刺激。 4.腓骨运动神经元缺乏收缩诱导的抑制作用，并且收缩诱导的兴奋发生率增加了这样一种可能性，即与腱器官传入的通常作用相反，腓骨短肌的Ib传入可能对同形运动神经元产生兴奋性影响。 I组的电刺激仅在腓骨运动神经元中引起腓骨短神经异常刺激，这一事实似乎与该假设相吻合。此外，已知促进Ib途径传播的皮肤传入刺激仅异常地显示出弱的收缩诱导抑制作用（摘要截断为250字）。

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