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Anatomy of giant serotonin-containing neurones in the cerebral ganglia of Helix pomatia and Limax maximus

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Summary

There is a giant serotonin-containing neurone (GSC) in each cerebral ganglion of Helix pomatia and Limax maximus. In Helix, presynaptic endings of the GSCs are located in the buccal ganglia and peripheral musculature. Dense-cored vesicles of mean diameter 100 nm were observed in the perikarya and the axon branches of the GSCs within the cerebral ganglia. Evidence is presented which suggests that these vesicles sequester serotonin. Vesicles with a similar appearance are present in the presumed presynaptic endings of the GSC in Helix. These endings selectively accumulate tritiated serotonin. Axonal processes containing agranular vesicles (mean diameter 50 nm), or granular vesicles (50–100 nm diameter), or both, make close contact with the fine axon branches of the GSCs within the cerebral ganglion neuropile. Some of these axon processes appear to be presynaptic endings making synaptic connections with the GSCs.

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We thank Dr. J.L.S. Cobb for reading the manuscript, J. Stevenson for photographic assistance, and the Medical Research Council for financial aid.

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Pentreath, V.W., Osborne, N.N. & Cottrell, G.A. Anatomy of giant serotonin-containing neurones in the cerebral ganglia of Helix pomatia and Limax maximus . Z.Zellforsch 143, 1–20 (1973). https://doi.org/10.1007/BF00307447

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