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refers to one of two components of an alternate segmentation of the dopaminergic cell groups found in the ventral midbrain tegmentum of the human and macaque. It includes the dopaminergic cells of the A10 cell group in the ventral tegmental area, the A8 cell group in the retrorubral area, and the compact part of the A9 cell group in pars compacta of the substantia nigra. The other component is the ventral tier dopaminergic cell group. The cells of the dorsal tier are less affected in Parkinson\'s disease and less vulnerable to MPTP treatment than those of the ventral tier ( Haber-2012 ).
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