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7例听神经瘤术时保留面神经,但术后出现了完全性持久面瘫。作者们在作面-舌下神经吻合术时,取面神经的鼓段,作光镜和电镜组织学检查,结果如下: 光镜检查:相当神经的运动区部,神经纤维大大减少,在非运动区的一、二束中直径细的髓鞘正常,内膜胶原纤维有轻度增加,雪旺氏细胞无明显减少。在横切面上,有髓神经纤维总数为3,766～5,405,多在非运动区内,至于运动区亦即变性区的纤维数仅为226～2,358。非运动区的纤维直径为2～4μm,运动区的为1～6μm,多数为1.5和3.5μm。直方图统计峰在1.5～3.0μm。各例的平均直径为2.0～3.5μm。电镜检查:运动区纤维出现变性,大多数有
In 7 cases of acoustic neuroma, the facial nerve was preserved, but complete persistent facial paralysis occurred. The authors used the face-sublingual nerve anastomosis to obtain the drum segments of the facial nerve for light and electron microscopy histological examinations. The results were as follows: Light microscopy examination: The nerves were significantly reduced in the motor area, and the nerve fibers were greatly reduced. One or two fine diameter myelin sheaths in the area were normal, there was a slight increase in intimal collagen fibers, and there was no significant reduction in Schwann cells. On the cross-section, the total number of myelinated nerve fibers was 3,766-5,405, mostly in non-motorized areas, and the number of fibers in the motorized area, ie the degeneration area, was only 226-2,358. The fiber diameter of the non-motorized zone is 2 to 4 μm, and the moving zone is 1 to 6 μm, and the majority is 1.5 and 3.5 μm. The histogram has a statistical peak of 1.5 to 3.0 μm. The average diameter of each example is 2.0 to 3.5 μm. Electron microscopy: The fibers in the sports area have degenerated, most of them have