Distribution of fluorogenic monoamines in the gastrointestinal muscularure of Helix pomatia.

By the use of a glyoxylic acid induced fluorescence method an intensive green fluorescence characteristic to catecholamines was observed on nerve fibres with varicosities, nerve bundles and perykaryons on wholemount stretch preparates of snail's gut. Considering the distribution of the fluorescent nerve elements and also the fluorescence intensity a decreasing gradient was revealed from the fore-gut through the stomach to the hind-gut.