[Adrenal reactions of monkeys to antiorthostatic hypokinesia]

The following experiments were performed to study the morphology of the adrenals of male rhesus monkeys: six monkeys were exposed to clinostatic hypokinesia for 7 days and then to head-down tilt at -6 degrees for 12 days; two monkeys were exposed only to head-down tilt for 7 days and 5 monkeys were used as controls. The adrenals exhibited changes of three types: stress-reaction manifestations, activation of the glomerular area of the cortex, and synchronization of the medullary matter to noradrenaline production. All these changes reflect adaptive reactions of the animal body to head-down tilt.