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The structure of the caudal wall of the zebrafish ( Danio rerio ) swim bladder: Evidence of localized lamellar body secretion and a proximate neural plexus
Author(s) -
Robertson George N.,
Croll Roger P.,
Smith Frank M.
Publication year - 2014
Publication title -
journal of morphology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.652
H-Index - 74
eISSN - 1097-4687
pISSN - 0362-2525
DOI - 10.1002/jmor.20274
Subject(s) - biology , danio , zebrafish , anatomy , plexus , myenteric plexus , secretion , axon , lumen (anatomy) , lamellar granule , epithelium , microbiology and biotechnology , exocytosis , immunohistochemistry , endocrinology , ultrastructure , biochemistry , immunology , genetics , gene
In this study, we present a morphological description of the fine structure of the tissues composing the caudal tip of the adult zebrafish swim bladder and an immunochemical survey of the innervation at this site. The internal aspect of the caudal tip is lined by an epithelium specialized to secrete surfactant into the lumen as evinced by the exocytosis of lamellar bodies. The sole innervation to this region consists of a neural plexus, present on the external surface, of nitric oxide synthase‐positive (nNOS) neuronal cell bodies that are contacted by axon terminals, some containing neuropeptide Y and vasoactive intestinal polypeptide. As the specialized epithelium and neural plexus are coincident and of common extent, we suggest that the morphological relationship between the two elements allows the nervous system to affect surfactant processing, possibly through a paracrine mechanism. J. Morphol. 275:933–948, 2014. © 2014 Wiley Periodicals, Inc.