Browner R H, Marbey D
Department of Anatomy, New York Medical College, Valhalla 10595.
Hear Res. 1988 Jun;33(3):257-71. doi: 10.1016/0378-5955(88)90156-6.
Eighth nerve endings and neuronal types in the nucleus magnocellularis were analyzed in the red-eared turtle (Chrysemys scripta elegans). One group of turtles had horseradish peroxidase (HRP) injected into the surgically exposed inner ear. Following injection the animals survived for 3-5 days and then their 8th nerve fibers and endings were analyzed. A second group of turtles were impregnated by the Golgi-Kopsch technique. This also demonstrated 8th nerve endings and neurons in the nucleus magnocellularis. A third group had brains stained with cresyl violet to demonstrate normal morphology. Two types of neurons were present in the nucleus magnocellularis; bushy and stellate. Bushy neurons had a single primary dendrite with little branching and spines. Stellate neurons had 3-5 primary dendrites with secondary order branching and dendritic spines. Thick 8th nerve axons gave rise to endbulbs of Held and their axons formed bouton-type ending. Endbulbs of Held were presently only on bushy neurons while bouton-type terminals were only on stellate neurons. Endbulbs of Held had two patterns; one group was cup-shaped and surrounded approximately 1/2 of the soma without appendages. A second type had a smaller cup with 3-5 extensions to other parts of the cell. Stellate neurons had terminal boutons adjacent to the cell membrane. They appeared in some situations as a necklace surrounding the neuron.
对红耳龟（锦龟指名亚种）延髓巨细胞核中的第八神经末梢和神经元类型进行了分析。一组乌龟通过手术暴露内耳后注射辣根过氧化物酶（HRP）。注射后，这些动物存活3至5天，然后对其第八神经纤维和末梢进行分析。第二组乌龟采用高尔基-科普施技术进行浸染。这也显示了延髓巨细胞核中的第八神经末梢和神经元。第三组乌龟的大脑用甲酚紫染色以显示正常形态。延髓巨细胞核中有两种类型的神经元；密集型和星型。密集型神经元有一个单一的初级树突，几乎没有分支和棘突。星型神经元有3至5个初级树突，有二级分支和树突棘。粗大的第八神经轴突产生赫尔德终球，其轴突形成纽扣型末梢。赫尔德终球目前仅存在于密集型神经元上，而纽扣型终末仅存在于星型神经元上。赫尔德终球有两种模式；一组是杯状的，包围着大约一半的胞体，没有附属物。第二种类型有一个较小的杯状结构，有3至5个延伸到细胞其他部分的分支。星型神经元有与细胞膜相邻的终纽扣。在某些情况下，它们呈现为围绕神经元的项链状。
