Strutz J, Münker G, Zöllner C
Department of Oto-Rhino-Laryngology, University of Freiburg, Federal Republic of Germany.
Arch Otorhinolaryngol. 1988;245(2):108-11. doi: 10.1007/BF00481446.
The number and the location of the motor neurons innervating the stapedius or tensor tympani muscles in the guinea pig were identified by retrograde axonal transport of the tracer horseradish peroxidase. Tracer injections were made either into the stapedius or tensor tympani muscle and effected the retrograde labeling of neurons in the ipsilateral brain stem. These findings showed that the stapedius motor neurons lie outside the traditionally recognized facial nucleus and are present in two cell columns: ventromedial and dorsomedial to the facial nucleus. These labeled neurons are dissimilar to cells within the facial nucleus, i.e. they are smaller and more fusiform in shape. The tensor tympani motor neurons were found outside the trigeminal motor nucleus. At a rostral level they were located in a region ventral and ventrolateral to the latter nucleus. These labeled neurons were smaller than the trigeminal motor neurons and polygonal in shape. In the animals studied there were about six times more tensor tympani motor neurons than stapedius motor neurons.
通过辣根过氧化物酶示踪剂的逆行轴突运输，确定了豚鼠中支配镫骨肌或鼓膜张肌的运动神经元的数量和位置。示踪剂注射到镫骨肌或鼓膜张肌中，对同侧脑干中的神经元进行逆行标记。这些发现表明，镫骨肌运动神经元位于传统上公认的面神经核之外，存在于两个细胞柱中：面神经核的腹内侧和背内侧。这些标记的神经元与面神经核内的细胞不同，即它们更小且形状更呈梭形。鼓膜张肌运动神经元位于三叉神经运动核之外。在较靠前的水平，它们位于后一个核的腹侧和腹外侧区域。这些标记的神经元比三叉神经运动神经元小，呈多边形。在所研究的动物中，鼓膜张肌运动神经元的数量大约是镫骨肌运动神经元的六倍。
