THE PROJECTION OF THE FRONTAL LOBE ON THE HYPOTHALAMUS

Abstract

Connections between the cerebral cortex of the frontal lobe and the hypothalamus were investigated in Macaca mulatta monkeys by the method of physiological neuronog-raphy in which strychnine is applied to the cortex and the propagated electrical disturbance recorded from the projection fibers in the depths of the brain. Discrete projections have been demonstrated from area 6a of the cortex to the mammillary nuclei, the lateral hypothalamic area and to the posterior hypothalamic area. Projections have been demonstrated to the supra-optic and paraventricular nuclei from specific areas of the frontal lobe and the orbital surface, the latter also projecting to the posterior hypothalamic area.