1. The properties of fifty-two stretch receptors in the extraocular muscles were studied in thirty cats. Between ten and twenty-eight receptors were observed in each preparation.2. In four preparations, spontaneously discharging receptors were observed, with afferent fibre conduction velocities ranging from 16·9 to 41·1 m/sec.3. In the remaining twenty-six cats, the minimal threshold receptors ranged from 3 to 130 g, with a peak distribution between 10 and 20 g, and afferent fibre conduction velocities ranging from 6·5 to 52·0 m/sec, the peak being between 10 and 15 m/sec. Of these receptors, nineteen were quickly adapting and seven were slowly adapting.4. The dynamic and static indexes of all the receptors were essentially similar; they both increased markedly on increasing the initial length. This suggests that the receptors do not lie in contact with regions of reduced viscosity on the muscle fibres comparable to the equatorial region of the intrafusal muscle fibres.5. All of the receptors were located in the muscle; none was located in the tendon. Forty-seven of forty-nine receptors were in parallel and two receptors were in series with the contractile elements.6. The properties of all the receptors studied appeared to be similar, suggesting that a single type of stretch receptor is located in the inferior oblique muscle of cats.
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机译:1.在三十只猫中研究了眼外肌中52种拉伸受体的特性。在每种制剂中观察到十至二十八种受体。2。在四种制剂中,观察到自发放电受体,传入纤维传导速度范围为16·9至41·1m / sec.3。在其余的26只猫中,最小阈值受体的范围为3至130 g,峰值分布在10至20 g之间,传入纤维传导速度的范围为6·5至52·0 m / sec,峰值为在10至15 m / sec之间。在这些受体中,有十九个快速适应,七个缓慢适应。4。所有受体的动态和静态指标基本相似。随着初始长度的增加,它们都显着增加。这表明受体不与肌纤维内赤道区域可比的肌纤维上粘度降低的区域接触。5。所有的受体都位于肌肉中。没有一个位于肌腱内。四十九个受体中有四十七个是平行的,两个受体与收缩元件串联。6。研究的所有受体的特性似乎都相似,这表明单一类型的拉伸受体位于猫的下斜肌中。
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