Definition: That part of the diencephalon that lies wedged between the thalamus on the posterior side and the cerebral peduncle anteriorly, lateral to the posterior 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.
Synonym(s): ventral thalamus
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