Neuromorphometric features and dimensional analysis of the vestibular end organ in the little brown bat (Myotis lucifugus)

The Journal of Comparative Neurology
F RamprashadJ Laufer

Abstract

Neuromorphometric parameters of the vestibular system were determined from serial sections of temporal bones from four little brown bats. Well-developed eminentiae cruciatae project from the cristae ampullares of the anterior and posterior membranous ampullae. A total of 4,500 bipolar ganglion cells were enumerated within the vestibular ganglion. The widths of the cell somas varied from 2.5 to 20 micrometers, with 70% of them having widths between 5.0 and 12.5 micrometers. Two maxima were observed in a curve of ganglion cell density as a function of the length of the ganglion. The first maximum indicated a density of 4,800 cells per mm2 at a length 0.20 from the apex of the ganglion (in the pars dorsalis); the second, a density of 4,750 cells per mm2 at 0.38 mm (in the pars ventralis). The morphometric parameters studied were the radii of curvature of the semicircular ducts, the cross-sectional diameters of the semicircular canals and ducts, the dimensions of the cristae ampullares and their membranous ampullae, and dimensions pertaining to the statoconial organs. Surface areas (measured from graphic projections) were determined as 0.098 mm2 and 0.016 mm2 and hair cell count 500 and 1,300 cells for the saccular and utricular ma...Continue Reading

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Citations

Jun 20, 2007·Proceedings of the National Academy of Sciences of the United States of America·Fred SpoorAlan Walker
Sep 18, 2001·The Journal of Comparative Neurology·M Kirkegaard, J M Jørgensen
Dec 17, 2009·Journal of Anatomy·Philip G Cox, Nathan Jeffery
Jan 28, 2006·Hearing Research·Timothy E Hullar, Campbell D Williams
Sep 1, 2006·Journal of Neurophysiology·Asim HaqueJ David Dickman
Jul 9, 2004·Journal of Neurophysiology·Sapan S DesaiAnna Lysakowski

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