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At least 109 records · Page 6Linked to original sources
PubMed1988

[Effect of the stimulus medium--water or air--in thermal evaluation of the vestibular apparatus].

The influence of the stimulus medium in thermal vestibular tests has been investigated by many authors, comparing nystagmus reactions after air and water irrigations. We first measured temperature changes in the ear canal and in the horizontal semicircular canal after both kinds of stimuli, using human temporal bone preparations, which were placed in a water bath of 37 degrees C. Irrigations were done with air of 45 and 27 degrees C with a flow of 5 l/min during 45 s and with 100 ml water of 44 and 30 degrees C during 30 s. The maximum temperature changes in the ear canal are almost equal after both kinds of irrigation (see Figs. 2 and 3). The change of temperature, however, lasts longer after water irrigation. The time constants are 20 and 57 s for the decay after warm and cold water irrigation and 9 and 20 s after air irrigation, respectively. The maximum temperature change in the lateral part of the horizontal semicircular canal is 0.4 and -0.3 degree after warm and cold irrigation with water. The corresponding values after irrigation with air are 0.1 and -0.15 degree. In addition, we investigated the effect of irrigating temporal bone preparations with perforated tympanic membranes (Fig. 4). After irrigation with air of 45 degrees C, the temperature in the horizontal semicircular canal decreased due to evaporation of humidity in the tympanic cavity. The equipment of choice for the irrigation of such ears is a stimulator reported by Scherer, where water flows through a silicon bubble which coats the ear canal.(ABSTRACT TRUNCATED AT 250 WORDS)

Air↗
PubMedDate not supplied

[Numerical modeling of convection diffusion of endolymph in porous structures of the vestibular apparatus].

The mathematical algorithm of the diffusive model of vestibular reception is discussed. The conditions to reduce arising 3-dim boundary value problem to 1-dim one are found. And it is shown, that separate diffusive canaliculi as a mechanical transducers demonstrate the apparently clear properties of the frequency selectivity relating to their transduction of the endolymph space pressure into the endolymph concentration changes in their outputs. Some numerical experimental results are presented and discussed.

Diffusion↗
PubMed1980

[Bioelectrical activity of limb muscles during shivering while stimulating the vestibular apparatus].

The effects of caloric and electric stimulation of the vestibular receptors on the EMG activity of limb muscles in anesthetized cats during cold-induced shivering involved flexor muscles alone. Both types of stimulation suppressed bioelectrical activity, more effectivey in the ipsilateral muscles. The suppression of shivering activity seems to be due to the increased inhibitory effect of descending labyrinth pathways on the function of flexor motoneurons.

Animals↗