A9 and A10 cell groups

Both the medial and the central divisions of the extended amydala receive dopaminergic innervation from all the midbrain dopaminergic cells groups (A8, A9 and A10) the medial extended amygdala projects to the VTA, and the circuits efferent from the central extended amygdala also target the VTA, as well as the RRA (Alheid et al., 1995 De Olmos et al., 2004) (Fig. 19). 

Fig. 2. A. Forebrain dopamine projection system in rodents and primates. The nigrostriatal pathway projects from the A8 and A9 groups of the substantia nigra (SN) via the medial forebrain bundle (mfb) to the neostriatum (NS). The mesocorticolimbic pathway projects from the more medially located A10 cell group of the ventral tegmental area (VTA) to the nucleus accumbens (NAcc) and olfactory tubercle (OT) of the ventral striatum (VS) and limbic forebrain areas including prefrontal cortex (Ctx), septum (Se) and amygdala (A). B. Striatal projection areas in the rodent brain are divided into the more dorsal neostriatum, and ventral striatum. C. In the primate brain, including human and illustrated for the marmoset, the neostriatum is divided by the fibers of the internal capsule into caudate nucleus (CN) and putamen (Pu). Correspondingly, the neostriatum of rats is sometimes designated the caudate-putamen (CPu) complex.

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