Lehtosalo J I, Uusitalo H, Palkama A
Exp Brain Res. 1984;55(3):562-9. doi: 10.1007/BF00235287.
We have studied the ultrastructural features of sensory nerve fibers in the ciliary body and the iris and their parent trigeminal ganglion cells, using intra-axonally transported horseradish peroxidase as a tracer. Unmyelinated nerve fibers of ipsilateral trigeminal origin were found in stroma of both the ciliary body and the iris. Most appeared in bundles of nerve fibers; but some were found singly. Two distinct types of varicosities were found, one containing both a few irregularly shaped vesicles and mitochondria, the other containing mitochondria only. The thin profiles of the axons between these varicosities or endings contained neurotubules and filaments. The trigeminal ganglion cells supplying the anterior eye were of a relatively small size (15-50 micron in diameter) and confined to the anteromedial part of the ipsilateral ganglion. These cells could not be classified according to the arrangement of their subcellular organelles. The morphological characteristics of the sensory nerve fibers and ganglion cells supplying the anterior uvea are consistent with the view that pain may be the predominant sensation mediated by these neurons.
我们使用轴突内运输的辣根过氧化物酶作为示踪剂，研究了睫状体和虹膜中感觉神经纤维及其母三叉神经节细胞的超微结构特征。在睫状体和虹膜的基质中均发现了同侧三叉神经起源的无髓神经纤维。大多数呈神经纤维束状出现，但也有一些是单独发现的。发现了两种不同类型的膨体，一种含有一些形状不规则的囊泡和线粒体，另一种仅含有线粒体。这些膨体或终末之间的轴突细段含有神经微管和细丝。供应眼前部的三叉神经节细胞相对较小（直径为15 - 50微米），局限于同侧神经节的前内侧部分。这些细胞不能根据其亚细胞器的排列进行分类。供应眼前葡萄膜的感觉神经纤维和神经节细胞的形态学特征与这些神经元介导的主要感觉可能是疼痛这一观点相一致。
