?:definition
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refers to a set of substructures of the interbrain grouped on the basis of multiple criteria including connectivity and function. It consists of parts of the anterior hypothalamic region, intermediate hypothalamic region, lateral hypothalamic area and subthalamus. Many neuroanatomists consider this heterogeneous zone to be the interstitial nucleus of the medial forebrain bundle and the rostral end of the reticular formation (functional) ( Swanson-2004 ).
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