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首页> 外文期刊>Journal of Neurophysiology >Comparison of static fusimotor innervation in cat peroneus tertius and longus muscles.
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Comparison of static fusimotor innervation in cat peroneus tertius and longus muscles.

机译：猫腓肠和长肌的静态融合运动神经支配的比较。

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Static fusimotor innervation was compared in cat peroneus longus and tertius muscles because the gamma to spindle ratio is considerably higher in the longus (approximately 60 gamma axons for 17 spindles) than in the tertius (approximately 24 gamma axons for 14 spindles). Single gamma axons were identified as static (gamma(s)) by their typical effects on the response of primary ending to ramp stretch. The intrafusal muscle fibers that single gamma(s) axons activated in the spindles they supplied were identified by the features of cross-correlograms between Ia impulses and stimuli, at 100 Hz, and by those of primary ending responses during stimulation at 30 Hz. In each experiment, a large proportion of the gamma population was tested on about nine spindles. A statistical analysis was used to estimate the number of spindles supplied by single gamma(s) axons and the proportion of gamma(s) axons that supply only one spindle among those the stimulation of which had activated either bag2 or chain fibers alone in a single spindle. In peroneus longus, nearly all gamma(s) axons supply one or two spindles, whereas in peroneus tertius, the majority of gamma(s) axons supply from three to six spindles. The proportion of nonspecifically distributed gamma(s) axons, i.e., of axons that supply both bag2 fibers and chain fibers either in the same or in different spindles, is much lower (56%) in the longus than in the tertius (83%) as previously observed on a population of gammas axons that supplied from three to six spindles. Correspondingly, the proportion of specific axons is much higher in the longus (44%) than in the tertius (17%). In none of the two muscles was a strict relationship observed between the conduction velocity of gamma(s) axons and their intrafusal distribution (specific bag2, specific chain fibers, nonspecific). However, gamma(s) supplying bag2 fibers either specifically or in combination with chain fibers tended to have faster conduction velocities, which suggests that, in various motor acts, the proportion of activated bag2 and chain fibers may be related to the proportions of activated fast and slow gamma(s) axons.
机译：在猫腓骨的长直肌和畸形肌中比较了静态融合运动神经支配，因为长直肌（17根纺锤的轴突约为60伽玛轴突）比叔叔（约14根纺锤轴的约24伽玛轴突）的伽玛与纺锤比高得多。单个伽玛轴突通过其对主要末端对斜向伸展的响应的典型影响而被识别为静态（伽玛）。通过提供在100 Hz的Ia脉冲和刺激之间的互相关图的特征以及在以30 Hz刺激时的主要终末响应的特征来识别单个γ轴突在它们提供的纺锤中激活的融合肌内肌纤维。在每个实验中，在大约9个纺锤上测试了很大一部分的伽玛射线。使用统计分析来估计单个伽玛轴突提供的纺锤体数量和仅刺激单个纺锤激活单个bag2或链状纤维的那些中仅提供一个纺锤体的伽玛轴突的比例主轴。在腓骨长轴中，几乎所有伽玛轴突都提供一或两个纺锤体，而在腓骨畸形中，大多数伽玛轴突都提供三至六个纺锤体。非特定分布的伽玛轴突的比例，即在相同或不同纺锤中同时供应bag2纤维和链状纤维的轴突的比例，在长效方面要比叔叔低得多（56％）（83％）如先前在从三到六个纺锤提供的伽玛轴突种群中观察到的那样。相应地，长轴上特定轴突的比例（44％）比叔叔轴突（17％）高得多。在这两个肌肉中，没有一个在伽玛轴突的传导速度与其融合内分布（特定的bag2，特定的链纤维，非特定的）之间观察到严格的关系。但是，专门或与链纤维结合使用的供应bag2纤维的伽玛趋向于具有更快的传导速度，这表明在各种运动行为中，激活的bag2和链纤维的比例可能与快速激活的比例有关。和慢伽玛轴突。

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