Diaz-Regueira S, Anadón R
Departamento de Biologia Fundamental Colegio Universitario de La Coruña, Universidad de Santiago de Compostela, Spain.
J Hirnforsch. 1990;31(6):705-14.
The medullary nuclei and the primary projections of the octaval nerve have been studied in the Teleost Chelon labrosus, using argentic impregnations, NISSL stains and anterograde marking with peroxidase. The octaval nerve enters the medulla in two separate branches, the anterior and posterior. In its intramedullary traject it originates ascendent and descendent bundles. Its fibres end principally in the ventral part of the octavo-lateral area, with practically no overlapping with the terminals of the lateral line nerves. Three neuronal groups appear in this zone: the magnocellular vestibular nucleus, the tangential nucleus and the descending octaval nucleus. The magnocellular nucleus, formed by large neurons, receives thick fibres from the anterior branch of the octaval nerve. The tangential nucleus can be subdivided into three parts: Dorsal, intermediate and ventral depending upon its afferents and efferents. The dorsal part receives fibres from the posterior root of the octaval nerve. Fibres from the anterior branch end in the intermediate and ventral parts. The descending octaval nucleus, formed by polymorphous neurons, receives descending fibres from the octaval nerve branches. These fibres form a peculiar neuropil. A few fibres from both branches end in the medial nucleus of the octavolateral area. No primary projections of the octaval nerve have been found to the cerebellar crests.
利用银浸染法、尼氏染色法以及过氧化物酶顺行标记法，对硬骨鱼丽龟（Chelon labrosus）的髓核和听神经的主要投射进行了研究。听神经通过前支和后支这两个独立的分支进入延髓。在其髓内走行过程中，它发出上升束和下降束。其纤维主要终止于听外侧区的腹侧部分，与侧线神经的终末几乎没有重叠。在这个区域出现了三个神经元群：大细胞前庭核、切向核和听神经降核。大细胞核由大神经元组成，接受来自听神经前支的粗纤维。切向核根据其传入和传出纤维可分为三个部分：背侧、中间和腹侧。背侧部分接受来自听神经后根的纤维。来自前支的纤维终止于中间和腹侧部分。听神经降核由多形神经元组成，接受来自听神经分支的下降纤维。这些纤维形成了一种特殊的神经毡。来自两个分支的少数纤维终止于听外侧区的内侧核。未发现听神经向小脑嵴的主要投射。
