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Structural Characteristics and Development of Ampullary Organs in Acipenser naccarii
Authors:Susana Camacho  Maria Del Valle Ostos  José Ignacio Llorente  Ana Sanz  Manuel García  Alberto Domezain  Ramón Carmona
Affiliation:1. Department of Cell Biology, Faculty of Sciences, University of Granada, Campus Fuentenueva s/n, Granada, Spain;2. Department of Ecology and Animal Biology, Faculty of Sciences, University of Granada, Campus Fuentenueva s/n, Granada, Spain;3. I+D Department, Sierra Nevada Fish Farm Ltd., Riofrío, Granada, Spain;4. Fax: 958‐24‐32 58.
Abstract:Ampullary organs of Acipenser naccarii sturgeons were examined by optical and electronic microscopy (transmission electron microscopy and scanning electron microscopy) from hatching until 1 month later when the juvenile phase is completely established. It was observed that, when A. naccarii begins to feed actively, the ultrastructural characteristics of ampullary organs already correspond to those of adult animals. These organs may, therefore, be functional and, together with taste buds, facilitate food search after exhaustion of yolk sac food reserves. Mature ampullary organs of A. naccarii are formed by an ampulla that communicates with the exterior by means of a short channel. These ampullae correspond to the sensory portion of these receptors and are formed by two cell types: receptor cells and support cells. Receptor cells present a kinocilium on their free surface and establish ribbon synapses with axon nerve endings that arise from the underlying conjunctive tissue. Support cells enclose receptor cells, bear stereocilia and occasional cilia, and are of a secretory nature. The mucus associated with ampullary organs mainly comprises neutral mucopolysaccharides, whereas mucopolysaccharides are usually acid in other fish groups. Anat Rec, 290:1178–1189, 2007. © 2007 Wiley‐Liss, Inc.
Keywords:ampullary organ  electroreceptors  sturgeon  development  morphology  lateral line
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