Effect of Electrical Stimulation of the Limbic System on Pituitary-Thyroidal Function

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Abstract
Stimulation of the amygdaloid nuclear complex, the posterior orbital surface and the hippocampal formation was induced in anesthetized dogs previously labeled with J131 In each of 4 cases in which the posterior orbital surface and the amygdaloid nuclear complex were stimulated, there was no significant increase in the concentration of PBI131 and inorganic I131 in the thyroid venous blood. In 10 cases in which the hippocampal formation was stimulated, a definite increase was observed with no significant change in the thyroid vein blood flow. Significant increases in the TSH content of the jugular vein blood, assayed in 4 animals by McKenzie’s method, occurred in all cases within 30 min. Hypophysectomy prevented the response of the thyroid to hippocampal stimulation.