[Effect of the orbitofrontal zone of the cat cerebral cortex on the resistance of the supraoptic nuclei of the hypothalamus to ether].

Acute experiments on cats have shown that with an increase of ether anesthesia, the supravisual nucleus of the hypothalamus deprived of the influence of the orbitofrontal zone of the cerebral cortex gets less resistant to ether than an analogous nucleus that retained the subordination influence of the cortex. The highest resistance is demonstrated by the orbitofrontal zone of the cortex under conditions of ether anesthesia. In the course of the animal's wake up from anesthesia-induced sleep there takes place a recovery of bioelectrical activity primarily of the orbitofrontal zone of the cortex followed by the recovery of the supravisual nucleus which is under the cortex effect and finally of the supravisual nucleus deprived of the subordination effects of the cortex.