Definition: the region of fusion between the head of the caudate nucleus and the putamen, covered on its inferior aspect by the olfactory tubercle. Its former name nucleus accumbens septi (“a nucleus leaning against the septum”) refers to a medial, hook-shaped expansion of this anteroventral region of the striatum, which curves under the floor of the frontal horn of the lateral ventricle and ascends for some distance into the ventral half of the septal region. Composed of a pars lateralis [TA] (lateral part [TA] or core region [TAalt]) and a pars medialis [TA] (medial part [TA] or shell region [TAalt]).
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