Ultrastructure of the ampullae of Lorenzini of Aptychotrema rostrata (Rhinobatidae)

Wueringer, Barbara E., Tibbetts, Ian R. and Whitehead, Darryl L. (2009) Ultrastructure of the ampullae of Lorenzini of Aptychotrema rostrata (Rhinobatidae). Zoomorphology, 128 1: 45-52. doi:10.1007/s00435-008-0073-5

Author Wueringer, Barbara E.
Tibbetts, Ian R.
Whitehead, Darryl L.
Title Ultrastructure of the ampullae of Lorenzini of Aptychotrema rostrata (Rhinobatidae)
Journal name Zoomorphology   Check publisher's open access policy
ISSN 0720-213X
Publication date 2009-02
Sub-type Article (original research)
DOI 10.1007/s00435-008-0073-5
Volume 128
Issue 1
Start page 45
End page 52
Total pages 8
Place of publication Berlin ; New York
Publisher Springer International
Language eng
Subject 0608 Zoology
06 Biological Sciences
Abstract Small epidermal pores of the electrosensory ampullae of Lorenzini located both ventrally and dorsally on the disk of Aptychotrema rostrata (Shaw and Nodder, 1794) open to jelly-filled canals, the distal end of which widens forming an ampulla that contains 6 ± 0.7 alveolar bulbs (n = 13). The sensory epithelium is restricted to the alveolar bulbs and consists of receptor cells and supportive cells. The receptor cells are ellipsoid and their apical surfaces are exposed to the alveolar lumen with each bearing a single central kinocilium. Presynaptic bodies occur in the basal region of the receptor cell immediately proximal to the synaptic terminals. The supportive cells that surround receptor cells vary in shape. Microvilli originate from their apical surface and extend into the alveolar lumen. Tight junctions and desmosomes connect the supportive cells with adjacent supportive and receptor cells in the apical region. The canal wall consists of two cell layers, of which the luminal cells are squamous and interconnect via desmosomes and tight junctions, whereas the cells of the deeper layer are heavily interdigitated, presumably mechanically strengthening the canal wall. Columnar epithelial cells form folds that separate adjacent alveoli. The same cells separate the ampulla and canal wall. An afferent sensory nerve composed of up to nine myelinated nerve axons is surrounded by several layers of collagen fibers and extends from the ampulla. Each single afferent neuron can make contacts with multiple receptor cells. The ultrastructural characteristics of the ampullae of Lorenzini in Aptychotrema rostrata are very similar to those of other elasmobranch species that use electroreception for foraging.
Keyword Ampullae of Lorenzini
Frequency electrosensory systems
Alveolar bulbs
Receptor cell
Aptychotrema rostrata
Q-Index Code C1
Q-Index Status Provisional Code

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Biological Sciences Publications
Ecology Centre Publications
Centre for Marine Studies Publications
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Created: Thu, 03 Sep 2009, 08:57:50 EST by Mr Andrew Martlew on behalf of Faculty of Science