Abstract

1. 20 hours after ligaturing the Helix pomatia visceral nerve there is a marked increase in the level of amine fluorescence proximal to the constriction and a reduction in the level distal to the constriction. 2. Concomitant with the increase in fluorescence, there is an increase in the number of small granular vesicles (30 to 150 nm in diameter) in the nerve fibres proximal to constrictions. At least some of these granules contain amines. 3. Bioassay experiments show that the increase in amine fluorescence is due in part to an increase in the level of 5-hydroxytryptamine. 4. It is concluded that 5-hydroxytryptamine and primary catecholamines are transported, bound to small granules, from the central nervous system along the visceral nerve towards peripheral nerve terminations.

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