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The spiral ganglion and Rosenthal's canal in beluga whales
Author(s) -
Sensor Jennifer D.,
Suydam Robert,
George John C.,
Liberman M. C.,
Lovano Denise,
Rhaganti Mary Ann,
Usip Sharon,
Vinyard Christopher J.,
Thewissen J. G.M.
Publication year - 2015
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.20434
Subject(s) - beluga whale , spiral ganglion , biology , beluga , anatomy , cochlea , ear canal , ganglion , fishery , arctic , acoustics , ecology , physics
ABSTRACT With the increase of human activity and corresponding increase in anthropogenic sounds in marine waters of the Arctic, it is necessary to understand its effect on the hearing of marine wildlife. We have conducted a baseline study on the spiral ganglion and Rosenthal's canal of the cochlea in beluga whales ( Delphinapterus leucas ) as an initial assessment of auditory anatomy and health. We present morphometric data on the length of the cochlea, number of whorls, neuron densities along its length, Rosenthal's canal length, and cross‐sectional area, and show some histological results. In belugas, Rosenthal's canal is not a cylinder of equal cross‐sectional area, but its cross‐section is greatest near the apex of the basal whorl. We found systematic variation in the numbers of neurons along the length of the spiral ganglion, indicating that neurons are not dispersed evenly in Rosenthal's canal. These results provide data on functionally important structural parameters of the beluga ear. We observed no signs of acoustic trauma in our sample of beluga whales. J. Morphol. 276:1455–1466, 2015. © 2015 Wiley Periodicals, Inc.