Abstract
The intestine of Aldrichetta forsteri was examined ultrastructurally for evidence of 5-HT-containing intrinsic neurons. A population of nerve cell bodies and processes characterized by the presence of amine-containing vesicles was found after the destruction of adrenergic processes with 6-hydroxydopamine. The distribution of the neurons matched that of the 5-HT-containing neurons previously seen with formaldehyde-induced fluorescence and 5-HT immunohistochemistry in A. forsteri and other teleosts. The axons made close contacts with the circular smooth muscle layer and the muscularis mucosae. The axons also lay exposed to the epithelial cells of the mucosa but did not make contact with neurons or with the longitudinal smooth muscle layer.
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