PMID: 6977985Mar 1, 1982Paper

Semicircular canals: measurement of endolymphatic and cupular displacements at threshold

Acta Oto-laryngologica
R E Malcolm, T E Bechard

Abstract

The left horizontal semicircular canal of the leopard frog (Rana pipiens) was exposed and the entire intact nerve was draped over a platinum-iridium hook for recording action potentials (a.p.'s). The preparation was then rotated sinusoidally in the horizontal plane at 0.3 Hz with varying angular displacements. The arm of the canal was then transected, and a fine micropipette ligated in place in one end of the arm. Artificial endolymph was pumped into and out of the canal at the same frequency, while the amplitude of the displacement was varied from sub-threshold to supra-threshold values as determined from the resulting a.p. train. By comparing the two a.p. trains, it was determined that the movement of endolymph in the canals was 5.3 x 10(-8) cm3/deg/s, and that the threshold displacement of the midpoint of the cupula was 7.6 x 10(-5) cm (0.76 micrometers).

References

Jan 1, 1979·Neuroscience·J W McLaren, D E Hillman
Nov 17, 1978·Brain Research·A Flock, M H Goldstein
Mar 1, 1974·Journal of Applied Physiology·D E DickJ V Weil
Jul 1, 1971·Acta Oto-laryngologica·M Anliker, W Van Buskirk
Jan 1, 1971·The American Journal of Physiology·K E MoneyR S Weaver
Mar 26, 1963·Proceedings of the Royal Society of London. Series B, Containing Papers of a Biological Character·G M JONES, K E SPELLS
Dec 15, 1949·The Journal of Physiology·A A J VAN EGMONDL B W JONGKEES

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Citations

Jan 1, 1985·Archives of Oto-rhino-laryngology·M Suzuki, Y Harada
Nov 1, 1985·Acta Oto-laryngologica·H P Wit, E Dijkgraaf

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