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本研究是通过实验损伤家兔面神经的口轮匝肌支致成此肌麻痹以观察其恢复情况。试验共分两部分: 面神经部分切断后肌肉神经系统的功能观察动物麻醉后,暴露面神经的右侧口轮匝肌支,先在睑裂中线的近侧刺激并记录诱发波和肌肉收缩,其后在手术显微镜下用剪刀剪断口轮匝肌神经直径的1/4;再刺激损伤神经的近端,对产生的诱发波和口轮匝肌收缩进行测定,继而分别切断神经的约1/2、3/4及7/8,作相同的观察。电生理学测量的结果与神经切断前记录的结果作比较。 [结果] 面神经被切断1/4的家兔,摄取食物时口轮匝肌的运动消失,表明面神经麻痹,然而切断神经直径的1/4及1/2所引起的诱发波和肌肉收缩,在振幅和时间方面与神经切断前无区别。当神经切断的程度增至3/4及7/8时,诱发波
This study is through experimental damage to the facial nerve of the orbicularis oris muscle branches into the muscle paralysis to observe the recovery. The experiment is divided into two parts: the facial nerve after partial cut off the function of the muscular nervous system anesthesia, the exposed facial nerve of the right side of the orbicularis muscle branch, the first in the palpebral fissure proximal stimulation and record induced wave and muscle contraction, then Under the operating microscope, scissors were used to cut ¼ of the nerve diameter of the orbicularis oris muscle; the proximal part of the injured nerve was re-stimulated to measure the evoked wave and the orbicularis muscle contraction, and then the nerve was cut off by about ½, 3/4 and 7/8 for the same observation. The results of electrophysiological measurements were compared with those recorded before nerve transection. [Result] The rabbits whose facial nerve was cut off by 1/4 had no orbital orbicularis muscle movement during food ingestion, indicating paralysis of the facial nerve. However, evoked wave and muscle contraction caused by cutting the nerve diameter by 1/4 and 1/2 There is no difference between amplitude and time before nerve transection. Waves were induced when the degree of nerve transection increased to 3/4 and 7/8