The effect of a 2-week space mission on the geometry parameters of giant multipolar neurons of the brain stem reticular formation in the rats flown on board Cosmos-1887 and -2044 are studied. Compensation for a deficiency of vestibular informations from the trigeminal nerve system at the cost of an decreased length of the dendrites oriented toward primary sensory nucleus and from the vestibular system through an increase in the length of the vestibular sensory nuclei-oriented dendrites is discussed.
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