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refers to a \'\'heterogeneous set of structures on the medial and ventral cerebral hemisphere.\'\' It comprises the substantia innominata, basal nucleus, olfactory tubercle, islands of Calleja and overlying parts of the striatum and globus pallidus. It extends caudally into pars reticulata of the substantia nigra and rostrally includes the nucleus accumbens, nucleus of the diagonal band, nucleus of stria terminalis and septal nuclei ( Mai-2004 ).
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