Distribution and morphological characteristics of efferent neurons innervating end organs in the ear and lateral line of the European eel.

Distribution and morphological characteristics of efferent neurons innervating end organs in the ear and lateral line of the European eel.
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欧洲鳗耳和侧线支配终末器官的传出神经元的分布和形态特征。

DOI:
10.1002/cne.902650404
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发表时间:
1987
期刊:
The Journal of comparative neurology
影响因子:
--
通讯作者:
Roberts,BL
Roberts,BL
中科院分区:
--
文献类型:
--
作者:
Meredith,GE;Roberts,BL

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应用辣根过氧化物酶对相应的脑神经分支进行定位,确定了为鳗鱼迷路和侧线感觉器官提供传出神经支配的神经元。逆行标记的神经元位于单个正中柱,即八伏外侧传出核(OEN),位于紧吻侧,与支运动柱的面神经核重叠。我们估计,在大脑的每一侧,传出核包含大约60-70个神经元,其中大部分供应耳朵和头部的侧线系统。大多数神经元(约90%)与它们所支配的目标是同侧的。由于提供不同末端器官的神经元混杂在一起,因此在细胞核内没有清晰的地形秩序。然而,头部侧线由位于喙侧的神经元提供,而身体系统则由更多的尾侧神经元提供。提供不同靶点的神经元在细胞形态上没有明显差异。大多数是多极的,大小相对均匀,并且有广泛的树突。一些细胞的树突延伸到大脑的对侧。传出轴突直径较小(~ 3 μm)。两个神经元在大小和位置上是足够恒定的,因此它们可以在不同的鱼之间被一致地识别出来。它们的轴突分支供应多个目标。几乎所有的传出神经元都有乙酰胆碱酯酶染色,靠近中线的一些神经元持续呈弱染色。
Neurons that provide the efferent innervation to the labyrinthine and lateral line sense organs of the eel were located by applying horseradish peroxidase to branches of the appropriate cranial nerves. Retrogradely labeled neurons were found in a single median column, the octavolateralis efferent nucleus (OEN), located immediately rostral to and overlapping with the facial nucleus of the branchiomotor column. We estimate that on each side of the brain the efferent nucleus contains about 60–70 neurons, most of which supply the ear and the lateral line system of the head. Most neurons (∼90%) are ipsilateral to the targets they innervate. There is no crisp topographical order within the nucleus because neurons supplying different end organs intermingle. However, the head lateral line is supplied by rostrally located neurons, and the body system by more caudal neurons.There are no marked differences in cell form between neurons supplying different targets. Most are multipolar, relatively uniform in size, and have extensive dendrites. The dendrites of some cells extend to the contralateral side of the brain. Efferent axons are of small diameter (∼3 μm). Two neurons are sufficiently constant in size and location that they can be consistently recognized from fish to fish. Their axons branch to supply more than one target. Nearly all efferent neurons stain for acetylcholinesterase and some, bordering the midline, consistently stain weakly.
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