title: Neurosecretory cells with 'synaptoid perikarya' in Helix. A definitive description of secretory release from the somata of endocrine neurones.
abstract: Neurosecretory cells in the mollusc Helix have perikarya that show clear signs of adaptation for both the synthesis and the discharge of secretory material. They are characterized morphologically by juxtaposition with the neural lamella. Passage of hormone into the haemocoel is apparently facilitated in many cases by the extreme attenuation of areas of the lamella and perineurium adjacent to the perikarya and by other forms of histological differentiation. Presumptive sites of release are characterized by prominent aggregations of synaptoid vesicles and the discharge of the contents of secretory granules by exocytosis.
authors.affiliation: Department of Biology, University of Newcastle upon Tyne, England.
authors.forename: E
authors.initials: E
authors.lastname: Bayraktaroglu
authors.forename: A C
authors.initials: AC
authors.lastname: Whittle
authors.forename: D W
authors.initials: DW
authors.lastname: Golding
mesh_terms: D000818:Animals; D005089:Exocytosis; D005724:Ganglia / Q000166:cytology; D006372:Helix, Snails; D009474:Neurons / Q000502:physiology / Q000648:ultrastructure*; D009489:Neurosecretion; D013572:Synaptic Vesicles / Q000648:ultrastructure