Nordin M, Hagbarth K E, Thomander L, Wallin U
Acta Physiol Scand. 1986 Nov;128(3):379-87. doi: 10.1111/j.1748-1716.1986.tb07991.x.
Microneurographic recordings have for the first time been obtained from the human facial nerve trunk, close to its exit from the stylomastoid foramen. The aim was to search for evidence of an afferent or sympathetic component of the facial nerve at this level and to study the fascicular organization of motor fibres. Single unit discharges of motor axons were occasionally discerned, and all recordings showed multiunit motor impulses preceding the EMG activity of the appropriate facial muscles by about 5 ms during both blink reflexes and voluntary contractions. No evidence of low-threshold mechanoreceptive afferents was found. Electron microscopic studies at the level of recording showed unmyelinated axons but attempts to record nociceptive and sympathetic activity failed. However, deep facial pain evoked by intraneural stimulation suggested the presence of nociceptive afferents of non-cutaneous origin. Intrafascicular recording and stimulation showed that most fascicles were composed of motor axons innervating muscles within the whole ipsilateral half of the face.
首次从靠近茎乳孔出口处的人面神经干获取了微神经图记录。目的是在此水平寻找面神经传入或交感成分的证据，并研究运动纤维的束状组织。偶尔能辨别出运动轴突的单单位放电，并且所有记录都显示，在眨眼反射和随意收缩期间，适当面部肌肉的肌电图活动之前约5毫秒会出现多单位运动冲动。未发现低阈值机械感受性传入纤维的证据。在记录水平进行的电子显微镜研究显示有无髓鞘轴突，但记录伤害性和交感神经活动的尝试均告失败。然而，神经内刺激诱发的深部面部疼痛提示存在非皮肤来源的伤害性传入纤维。束内记录和刺激表明，大多数束由支配同侧半侧面部所有肌肉的运动轴突组成。
