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Subthalamus

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subthalamus

That part of the diencephalon that lies wedged between the thalamus on the dorsal side and the cerebral peduncle ventrally, lateral to the dorsal half of the hypothalamus from which it cannot be sharply delineated. It is composed of the subthalamic nucleus (corpus luysi), the zona incerta, and the fields of Forel; laterally it expands in a winglike fashion into the reticular nucleus of the thalamus; caudally it is continuous with the midbrain tegmentum.