THE FINE-STRUCTURE OF 2 TYPES OF STELLATE CELLS IN THE ANTERIOR DIVISION OF THE ANTEROVENTRAL COCHLEAR NUCLEUS OF THE CAT
THE FINE-STRUCTURE OF 2 TYPES OF STELLATE CELLS IN THE ANTERIOR DIVISION OF THE ANTEROVENTRAL COCHLEAR NUCLEUS OF THE CAT
复制标题
DOI：
10.1016/0306-4522(81)90109-3
复制
发表时间：
1981-01-01
期刊：
影响因子：
3.3
通讯作者：
CANT, NB
中科院分区：
文献类型：
--
作者：
CANT, NB
本文对猫耳蜗前腹核前区的星状细胞进行了电镜观察。虽然只有一种类型的星状细胞已被确定在光学显微镜水平，两种类型可以识别在电子显微镜照片。这两种细胞都可以与同样存在于前分裂中的丛状细胞区别开来，因为它们缺乏丛状细胞特有的颗粒内质网核帽。I型星状细胞的胞体接受很少的突触接触，但突触终末的数量沿近端树突沿着显著增加。相反，II型星状细胞的索马和近端树突都接受大量的突触接触。这两种神经元类型都接受含有大的球形囊泡的突触末梢，并且在耳蜗消融后消失。这两种类型的星状细胞也与突触终末接触，突触终末具有类似于接触丛状细胞的小泡。此外，II型星状细胞接受一种与先前描述的不同的突触末端。这是一个相对较大的终末，含有大的扁平或盘状小泡，与突触后细胞形成轻微不对称的突触复合体。这些终端以及那些小突触囊泡生存耳蜗消融。结果表明，猫耳蜗前腹核前区至少含有三种类型的大神经元，每种神经元都接受来自耳蜗和其他来源的突触输入。每种类型表面的突触末梢的组织是不同的。由于耳蜗和非耳蜗突触末端的独特排列可能导致对声学刺激的不同响应模式，因此这些神经元类型中的每一种可以对应于生理学上定义的不同类型的单个单元。
The stellate cells in the anterior division of the anteroventral cochlear nucleus of the cat were studied with the electron microscope. Although only one type of stellate cell has been identified at the light-microscopic level, two types can be recognized in electron micrographs. Both can be distinguished from the bushy cells that are also present in the anterior division, since they lack the nuclear cap of granular endoplasmic reticulum characteristic of the bushy cells. The somas of the type I stellate cells receive very few synaptic contacts, but the number of synaptic terminals increases markedly along the proximal dendrites. In contrast, both the soma and proximal dendrites of the type II stellate cells receive numerous synaptic contacts. Both neuronal types receive synaptic endings that contain large, spherical vesicles and that disappear after cochlear ablation. Both types of stellate cells are also contacted by synaptic terminals with small vesicles similar to those that contact bushy cells. In addition, the type II stellate cells receive a type of synaptic ending unlike those previously described. This is a relatively large terminal, containing large, flattened or disk-shaped vesicles, and forming slightly asymmetric synaptic complexes with the postsynaptic cell. These terminals as well as those with small synaptic vesicles survive cochlear ablation. The sources of the non-cochlear terminals are not known.The results indicate that the anterior division of the anteroventral cochlear nucleus of the cat contains at least three types of large neurons, each of which receives synaptic input from the cochlea as well as from other sources. The organization of the synaptic endings on the surface of each type is different. Since distinctive arrangements of cochlear and non-cochlear synaptic terminals could result in different response patterns to acoustic stimuli, each of these neuronal types may correspond to a different type of single unit, defined physiologically.