Abstract
For the first time, mammalian brain has been studied during space flight aboard NASA orbital laboratory Spacelab-2. The main ultrastructural differences in the somatosensory cortex of the brain fixed under microgravity conditions and after landing include an increased number of degenerating presynaptic axon terminals after landing. Apparently, this is due to a sharp increase in afferent impulsation in the cortex during and after landing.
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