Uptake of ferritin into neurosecretory terminals

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Abstract
The release of neurosecretory products from terminals in the corpus cardiacum has been described in a few insect species (Scharrer 1963, 1968; Johnson 1966; Bowers & Johnson 1966; Normann 1965; Smith & Smith 1966; Smith 1970). Exocytosis has been suggested as the mechanism of release in Calliphora erythrocephala (Normann 1965, 1969) and in Carausius morosus (Smith & Smith 1966; Smith 1970), whereas fragmentation into ‘synaptoid’ regions has been indicated in Periplaneta americana (Scharrer 1963, 1968) and in Myzus persicae (Johnson 1966; Bowers & Johnson 1966). It is clear that structures representing both these features exist and differences in interpretation may depend on the sequence of events contributing to release. Using an electron-dense marker, an attempt has been made to determine the origin of the small vesicles which occur in neurosecretory axons and to throw some light on the dynamics of the release process.

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