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Medical Definition of Nucleus accumbens septi
1. The region of fusion between the head of the caudate nucleus and the putamen, covered on the ventral side by the olfactory tubercle. The name ("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. (05 Mar 2000)