Summary
Fluorescent histochemical studies have been made on the mucosa of the gut of a mammal (guinea-pig) and of some lower vertebrates (trout, eel, toad and lizard). Adrenergic nerves in the mucosa generally occur in perivascular plexuses. There appears to be no adrenergic innervation of the muscularis mucosae.
Yellow fluorescent enterochromaffin cells were observed in the mucosal epithelium of all species, including fish. Autofluorescent structures in the mucosa of these animals have also been described and were particularly prominent in the large intestines of teleost fish.
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Read, J.B., Burnstock, G. Fluorescent histochemical studies on the mucosa of the vertebrate gastrointestinal tract. Histochemie 16, 324–332 (1968). https://doi.org/10.1007/BF00306355
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DOI: https://doi.org/10.1007/BF00306355