Anatomy of diencephalic DA neuronal systems

The DA perikarya of incertohypothalamic (IH) DA neurons (identified as the A13 cell group) are clustered in the rostral portion of the medial zona incerta (MZI). These densely 

DA neurons projecting to the neural and intermediate lobes of the posterior pituitary were reported initially to originate from rostral A12 cells in the ARC and referred to as tuberohypophysial DA neurons (Bjorklund et al., 1973). More recent studies (Kawano and Daikoku, 1987 Goudreau et al., 1992, 1995) revealed that DA neurons projecting to the intermediate lobe of the posterior pituitary originate from a subpopulation of A[4 DA 

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