The structure of the nerve fibres in the chronically isolated cat ileum was studied by fluorescence and electron microscopy after imipramine group compounds, parachloro-phenylalanine, and 5-hydroxytryptamine treatment. Following treatment with parachloro-phenylalanine and imipramine group compounds in the nerve fibres of the small intestine, specific granules were selectively decreased (p < 0.001) in number. In concordance with ultra-structural observations, a marked diminution of fluorescence intensity was demonstrable in the small intestine. In addition, the number of the granular vesicles was significantly increased following 5-hydroxytryptamine treatment, and yellow fluorescent neurones and processes were observed in the myenteric and submucous plexuses. On the basis of these observations, the serotoninergic nature of certain nerve fibres could be dernonstra e .

Keywords:
Small intestine, Cat, Autonomic nervous system
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© 1978 S. Karger AG, Basel
1978
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