Summary
Temperature changes at different locations in the labyrinth were measured in human temporal bone preparations after syringing with water. In order to simulate physiological conditions, the preparations were placed in a water bath at 37°C. The maximum temperature changes in the horizontal semicircular canal after syringing with temperatures symmetrical to body temperature (44° or 30°C) were found to be clearly asymmetrical (with mean values of 0.6 and −0.3 K). From measurements in the external auditory meatus, findings showed that the reference temperature was 34°C in front of the tympanic membrane, which explains the asymmetry recorded. Measurements at different locations showed that the temperature first changes in the regions of the ampullae of the horizontal and the superior semicircular canals. In the vestibule the onset and decay of the temperature change is delayed. The time courses of the temperature difference between locations demonstrate that the temperature difference across the horizontal semicircular canal, which would be responsible for any convective effect in the endolymph, is of shorter duration than the absolute temperature change, which would be responsible for any temperature-mediated volume changes.
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References
Baertschi AJ, Johnson RN, Hanna GR (1975) A theoretical and experimental determination of vestibular dynamics in caloric stimulation. Biol Cybern 20:175–186
Cawthorne T, Cobb WA (1954) Temperature changes in the perilymph space in response to caloric stimulation in man. Acta Otolaryngol (Stockh) 44:580–588
Dohlmann G (1925) Physikalische und physiologische Studien zur Theorie des kalorischen Nystagmus. Acta Otolaryngol (Stockh) [Suppl 5]:1–186
Harrington JW (1969) Caloric stimulation of the labyrinth — experimental observations. Laryngoscope 79:777–793
Kleinfeldt D, Dahl D (1969) Temperaturmessungen am menschlichen Bogengang nach thermischer Reizung. Acta Otolaryngol (Stockh) 68:411–419
Meurmann Y (1924) Experimental investigations on conduction of warmth to the labyrinth of the ear and the caloric nystagmus. Acta Otolaryngol (Stockh) 6:555–567
Mulch G, Scherer H (1980) Die thermische Gleichgewichtsprüfung. HNO-Info 1:7–16
O'Neill G (1987) The caloric stimulus; temperature generation within temporal bone. Acta Otolaryngol (Stockh) 103:266–272
Scherer H (1984) Das Gleichgewicht. Springer, Berlin Heidelberg New York
Scherer H, Clarke AH, Brandt U, Merbold U, Parker R (1986) Caloric nystagmus in microgravity. Exp Brain Res 64:255–263
Schmaltz G (1931) The physical phenomena occurring in the semicircular canals during rotatory and thermic stimulation. Proc R Soc Med 25:359–381
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Keck, W., Thoma, J. Conduction of thermal stimuli in the human temporal bone. Arch Otorhinolaryngol 245, 335–339 (1988). https://doi.org/10.1007/BF00457989
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DOI: https://doi.org/10.1007/BF00457989