Abstract
1. 1. Specific granular cells were found in the heart, mantle and subesophageal ganglia of the snails Helix aspersa and Strophocheilus oblongus. 2. 2. Histochemical methods for the demonstration of enterochromaffin granules gave positive results in these cells. 3. 3. Differential osmium reduction by nerves in these hearts showed two kinds of fibres: osmiophilic and non-osmiophilic nerves and gives histological evidence of a double innervation (inhibitory and stimulatory fibres) to the snail heart. 4. 4. Osmiophilic endings are reported in the ventricle and auricle and are shown to end very close to the granular cells. 5. 5. No neurosecretory-staining material could be traced along nerves in these hearts. 6. 6. One large bipolar neuron is described in these hearts. 7. 7. Histological preparations of the heart of Strophocheilus oblongus that had long been stimulated through its cardiac nerve show a release of the granular content in the cells and disclose stages of a secretory cycle. It is suggested that these cells are glandular tissue and perform a hormonal function.
Published Version
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