Chazal G, Ohara P T
J Neurocytol. 1986 Dec;15(6):777-87. doi: 10.1007/BF01625194.
The nucleus raphe dorsalis of the cat was examined by serial section electron microscopy and the presence of vesicle-containing dendrites is reported. Such dendrites were divided into two classes according to their synaptic contact. Dendrites containing round and/or pleomorphic vesicles associated with a clear synaptic specialization which was generally intermediate between a Gray's type I or II were classified as presynaptic dendrites. These presynaptic dendrites were presynaptic to conventional dendrites and dendritic spines. In addition, some profiles containing a sparse population of vesicles which may be dendritic in nature were observed involved in serial synaptic arrangements. A second class of dendrites were characterized by the presence of vesicles which were never found associated with any synaptic membrane specialization. Commonly, the vesicles were densely packed and associated with unusual densities. Serial section analysis of these densities showed that they were not presynaptic dense projections. We suggest that the existence of vesicle-containing dendrites in the nucleus raphe dorsalis of the cat constitute the morphological support for the dendritic release of neurotransmitters.
通过连续切片电子显微镜对猫的中缝背核进行了检查，并报告了含囊泡树突的存在。根据其突触接触情况，此类树突分为两类。含有圆形和/或多形性囊泡且与通常介于格雷I型或II型之间的清晰突触特化相关的树突被归类为突触前树突。这些突触前树突对传统树突和树突棘是突触前的。此外，观察到一些含有稀疏囊泡群的形态可能为树突状的结构参与了连续突触排列。第二类树突的特征是存在从未发现与任何突触膜特化相关的囊泡。通常，这些囊泡密集堆积并与异常致密物相关。对这些致密物的连续切片分析表明它们不是突触前致密突起。我们认为猫中缝背核中含囊泡树突的存在构成了神经递质树突释放的形态学支持。
