Ezeasor D N
Z Mikrosk Anat Forsch. 1979;93(5):803-12.
Ultrastructural studies on the large intestine of the Rainbow trout revealed the hitherto unreported presence of neurons within the submucous plexus. The neurons were closely associated with axons which expanded intermittently along their length to form varicosities. According to the type and proportion of vesicles within the varicosities, three groups were distinguished. Group I varicosities contained a predominant population of small electronlucent vesicles measuring 30 nm in diameter. Group II varicosities contained a few medium-sized granular vesicles measuring 60 nm in diameter mixed with large numbers of small electronlucent vesicles. Most of the Group III varicosities contained large numbers of large granular vesicles, 90 nm in diameter. Varicosities of all groups formed axosomatic synapses. The significance of the presence of neurons in the submucous plexus of the trout large intestine is discussed. Group I and II varicosity profiles were interpreted as representing cholinergic and adrenergic innervation respectively. The identification of the transmitter substance in Group III varicosities, however, has still to be resolved.
对虹鳟鱼大肠的超微结构研究揭示了黏膜下神经丛中存在迄今未报道过的神经元。这些神经元与轴突紧密相连，轴突沿其长度间歇性扩张形成膨体。根据膨体内小泡的类型和比例，可分为三组。第一组膨体主要含有直径为30纳米的小的电子透亮小泡。第二组膨体含有一些直径为60纳米的中等大小的颗粒小泡，与大量小的电子透亮小泡混合。第三组膨体大多含有大量直径为90纳米的大颗粒小泡。所有组的膨体均形成轴体突触。文中讨论了虹鳟鱼大肠黏膜下神经丛中存在神经元的意义。第一组和第二组膨体形态分别被解释为代表胆碱能和肾上腺素能神经支配。然而，第三组膨体中递质物质的鉴定仍有待解决。
