Fischer F P, Eisensamer B, Manley G A
Institut für Zoologie der Technischen Universität München, Garching, Germany.
J Morphol. 1994 Apr;220(1):71-83. doi: 10.1002/jmor.1052200107.
Cochlear and lagenar components of the statoacoustical ganglion in the inner ear of one chicken were studied quantitatively in the TEM. Both myelinated and unmyelinated nerve fibers were present in these two parts of the ganglion and in a putative efferent bundle within the ganglion. The cochlear portion had the lowest, the efferent bundle the highest percentage of unmyelinated fibers. Compared to the other parts of the ganglia, the cochlear fibers had a high degree of homogeneity, especially in fiber size. Some gradients in the baso-apical direction were found, such as an increase in the size of myelinated cochlear fibers from the base to the apex. Based on the ultrastructure of cellular components, no distinct populations of cell bodies within the statoacoustical ganglion were definable. The ganglion contained some 8,000 cochlear and about 1,200-2,000 lagenar neurons. The putative efferent bundle had only 150-200 fibers. This cannot be the total number of efferents to the hair cells in both the basilar papilla and the lagenar. A large number of efferent fibers to the auditory papillae presumably run mingled among the afferent fibers.
利用透射电子显微镜对一只鸡内耳听神经节的耳蜗和壶腹嵴部分进行了定量研究。在神经节的这两个部分以及神经节内一个假定的传出束中，既有有髓神经纤维，也有无髓神经纤维。耳蜗部分无髓神经纤维的比例最低，传出束的比例最高。与神经节的其他部分相比，耳蜗纤维具有高度的同质性，尤其是在纤维大小方面。在基底 - 顶端方向发现了一些梯度变化，例如有髓耳蜗纤维从基部到顶端的尺寸增加。基于细胞成分的超微结构，在听神经节内无法明确区分出不同的细胞体群。该神经节包含约8000个耳蜗神经元和约1200 - 2000个壶腹嵴神经元。假定的传出束只有150 - 200根纤维。这不可能是到达基底乳头和壶腹嵴毛细胞的传出纤维总数。大量到达听觉乳头的传出纤维可能混在传入纤维中。
