Ariyasu L, Galey F R, Hilsinger R, Byl F M
Department of Otolaryngology, Kaiser Permanente Medical Center, Oakland, CA 94611.
Otolaryngol Head Neck Surg. 1989 Feb;100(2):87-91. doi: 10.1177/019459988910000201.
Computer-generated three-dimensional reconstructions of the nerve fibers from the organ of Corti to the spiral ganglion were used to determine the optimum maximal length of the cochlear implant electrode. The spiral ganglion within the modiolus is much shorter than the organ of Corti. The spiral ganglion has 1 3/4 turns and reaches no higher than the middle of the second turn of the organ of Corti, which has 2 3/4 turns. The spiral ganglion is concentric and basal with respect to the organ of Corti. The spiral ganglion dendrites within the osseous spiral lamina of the basal turn project radially, nearly perpendicular to the central axis of the modiolus. Upon entering the modiolus, they turn basally at an angle of approximately 120 degrees. The projection of dendrites within the osseous spiral lamina became increasingly oblique as the ganglion extended apically. The organization of the cochlear nerve results from the spiraling of the ganglion. These findings are in agreement with previous reports. Implications of these findings and their possible relevance to the optimum length of the cochlear implant electrode are discussed with reference to cochlear damage resulting from longer electrodes.
利用计算机生成的从柯蒂氏器到螺旋神经节的神经纤维三维重建图来确定人工耳蜗电极的最佳最大长度。蜗轴内的螺旋神经节比柯蒂氏器短得多。螺旋神经节有1¾圈，最高不超过有2¾圈的柯蒂氏器第二圈的中部。螺旋神经节相对于柯蒂氏器是同心且位于基部的。蜗底骨螺旋板内的螺旋神经节树突呈放射状投射，几乎垂直于蜗轴的中心轴。进入蜗轴后，它们以约120度的角度向基部转弯。随着神经节向顶部延伸，骨螺旋板内树突的投射变得越来越倾斜。耳蜗神经的组织结构是由神经节的螺旋形成的。这些发现与先前的报道一致。结合较长电极导致的耳蜗损伤，讨论了这些发现的意义及其与人工耳蜗电极最佳长度的可能相关性。
