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首页> 外文期刊>Journal of Neurophysiology >Whole-muscle and motor-unit contractile properties of the styloglossus muscle in rat.
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Whole-muscle and motor-unit contractile properties of the styloglossus muscle in rat.

机译：大鼠styloglossus肌肉的全肌肉和运动单位收缩特性。

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Investigations of whole muscle and motor-unit contractile properties have provided valuable information for our understanding of the spinal cord and extraocular motor systems. However, no previous investigation has examined these properties in an isolated tongue muscle. The purpose of this study was to determine the contractile properties and muscle fiber types of the rat styloglossus muscle. The styloglossus is one of three extrinsic tongue muscles and serves to retract the tongue within the oral cavity. Adult male Sprague-Dawley rats (n = 19) were used in these experiments. The contractile characteristics of the whole styloglossus muscle (n = 9) were measured in response to stimulation of the hypoglossal nerve branch to the muscle. The average twitch tension produced was 3.30 g with a mean twitch contraction time of 13.81 ms. The mean maximum tetanic tension was 19.66 g and occurred at or near the fusion frequency, which averaged 109 Hz. The styloglossus muscle was resistant to fatigue [fatigue index (F. I.) = 0.76]. In separate experiments (n = 7), the contractile characteristics of 37 single motor units were measured in response to extracellular stimulation of hypoglossal motoneurons. The twitch tension generated by styloglossus motor units averaged 35.7 mg, and the mean twitch contraction time was 12.46 ms. The mean fusion frequency was 92 Hz. Maximum tetanic tension averaged 177.8 mg. Styloglossus single motor units were resistant to fatigue (F. I. = 0.74). The sites of stimulation that yielded a contractile response in the styloglossus muscle were consistent with the location of the styloglossus motoneuron pool reported in earlier anatomy studies. Muscle fiber typing was determined in three animals based on the myofibrillar ATPase reaction at pH 9.8, 4.6, and 4.3. The styloglossus muscle was composed of approximately 99% type IIA fibers with a few scattered type I fibers present in the study sample. On the basis of the combined findings of the physiology and histochemistry experiments, the styloglossus muscle appeared to be a homogeneous muscle composed almost exclusively of fast, fatigue-resistant motor units. These properties of the styloglossus muscle and its motor units were compared with findings in other rat skeletal muscles.
机译：对全肌肉和运动单位收缩特性的研究为我们对脊髓和眼外运动系统的理解提供了有价值的信息。但是，以前没有调查研究过孤立舌肌中的这些特性。这项研究的目的是确定大鼠stylosslossus肌肉的收缩特性和肌肉纤维类型。口舌炎是三种外在舌头肌肉之一，用于将舌头缩回口腔内。在这些实验中使用成年雄性Sprague-Dawley大鼠（n = 19）。响应于舌下神经支配到肌肉的刺激，测量整个stylosslossus肌肉（n = 9）的收缩特性。产生的平均抽搐张力为3.30 g，平均抽搐收缩时间为13.81 ms。平均最大强直张力为19.66 g，出现在融合频率处或附近，融合频率平均为109 Hz。柱头肌对疲劳具有抵抗力[疲劳指数（F. I.）= 0.76]。在单独的实验（n = 7）中，响应于舌下运动神经元的细胞外刺激，测量了37个单个运动单位的收缩特性。由花拳运动单元产生的抽搐张力平均为35.7 mg，平均抽搐收缩时间为12.46 ms。平均融合频率为92 Hz。最大破伤风张力平均为177.8 mg。 Styloglossus单电机单元耐疲劳（F. I. = 0.74）。在stylossloss肌肉中产生收缩反应的刺激部位与早期解剖学研究报道的styloglossus motoneuron池的位置一致。根据pH 9.8、4.6和4.3的肌原纤维ATPase反应，在三只动物中确定了肌纤维的类型。臀肌由大约99％的IIA型纤维组成，研究样品中存在一些散布的I型纤维。根据生理学和组织化学实验的综合发现，花柱肌似乎是均质的肌肉，几乎全部由快速，抗疲劳的运动单元组成。将stylosslossus肌肉及其运动单位的这些特性与其他大鼠骨骼肌的发现进行了比较。

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