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- Title
Synaptic and Synaptoid Vesicles Constitute a Single Category of Inclusions: New Evidence From Invertebrate Nervous Systems.
- Authors
Gulding, G. W.
- Abstract
Parallel observations on synaptic and neurohaemal terminals in the polychacte annelids Nereis diversicolor and Harmothoe imbricata have revealed a remarkable identity of ultrastructure. Even features peculiar to the synaptic vesicles of polychaetes are mirrored by those of synaptoid inclusions. A wide range of terminal types show a clear duality of secretory inclusions, featuring both storage granules and synaptic/synaptoid vesicles, The inclusions exhibit a marked zonation. Vesicles form tight clusters with interstitial dense material in many terminals and these make contact with release sites. Terminals containing larger, typically peptidergic granules often have mainly dense-cored synaptic/synaptoid vesicles, although some such inclusions are present in other endings also. A variety of synaptic associations are present, and 'serial synaptoids' are formed by neurohaemal terminals. The results are interpreted to suggest that synaptic and synaptoid vesicles have a common functional significance.
- Subjects
INVERTEBRATES; NERVOUS system; ORGANELLES; ANNELIDA; NEREIS; COATED vesicles
- Publication
Acta Zoologica, 1982, Vol 63, Issue 2, p111
- ISSN
0001-7272
- Publication type
Article