The Structural and Functional Organization of the Vestibular Apparatus of Rats Exposed to Weightlessness for 20 Days on Board the Sputnik “KOSMOS-782”

Ya. A. Vinnikov Laboratory of Evolutionary Morphology, Sechenov Institute of Evolutionary Physiology and Biochemistry, Leningrad, USSR

O. G. Gazenko Laboratory of Evolutionary Morphology, Sechenov Institute of Evolutionary Physiology and Biochemistry, Leningrad, USSR

L. K. Titova Laboratory of Evolutionary Morphology, Sechenov Institute of Evolutionary Physiology and Biochemistry, Leningrad, USSR

A. A. Bronstein Laboratory of Evolutionary Morphology, Sechenov Institute of Evolutionary Physiology and Biochemistry, Leningrad, USSR

V. I. Govardovskii Laboratory of Evolutionary Morphology, Sechenov Institute of Evolutionary Physiology and Biochemistry, Leningrad, USSR

F. G. Gribakin Laboratory of Evolutionary Morphology, Sechenov Institute of Evolutionary Physiology and Biochemistry, Leningrad, USSR

R. A. Pevzner Laboratory of Evolutionary Morphology, Sechenov Institute of Evolutionary Physiology and Biochemistry, Leningrad, USSR

M. Z. Aronova Laboratory of Evolutionary Morphology, Sechenov Institute of Evolutionary Physiology and Biochemistry, Leningrad, USSR

T. A. Kharkeevich Laboratory of Evolutionary Morphology, Sechenov Institute of Evolutionary Physiology and Biochemistry, Leningrad, USSR

T. P. Tsirulis Laboratory of Evolutionary Morphology, Sechenov Institute of Evolutionary Physiology and Biochemistry, Leningrad, USSR

G. A. Pyatkina Laboratory of Evolutionary Morphology, Sechenov Institute of Evolutionary Physiology and Biochemistry, Leningrad, USSR

D. V. Lichakov Laboratory of Evolutionary Morphology, Sechenov Institute of Evolutionary Physiology and Biochemistry, Leningrad, USSR

L. P. Pal'mbach Laboratory of Evolutionary Morphology, Sechenov Institute of Evolutionary Physiology and Biochemistry, Leningrad, USSR

V. F. Anichin Laboratory of Evolutionary Morphology, Sechenov Institute of Evolutionary Physiology and Biochemistry, Leningrad, USSR

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Abstract

This investigation of the vestibular apparatus of rats exposed for 20 days to weightlessness on board an earth satellite and to acceleration during take-off and landing has revealed a set of changes in the structural and functional organization, such as adjoinment of the otolith to the utricle receptor surface and peripheral localization of the nucleoli inside the receptor cells’ nuclei. Destruction of some receptor cells, apparently due to increased swelling of the vestibular apparatus tissue and alteration of the shape and structure of the otoconia were observed. In the horizontal crista, detachment of the cupula took place.

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The Structural and Functional Organization of the Vestibular Apparatus of Rats Exposed to Weightlessness for 20 Days on Board the Sputnik “KOSMOS-782”

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The Structural and Functional Organization of the Vestibular Apparatus of Rats Exposed to Weightlessness for 20 Days on Board the Sputnik “KOSMOS-782”

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