Distribution of dopamine-containing and/or neuroendocrine cells in the hypothalamus. Schematic illustrations of hypothalamic sections at the level of the medial preoptic area (AVPv, MPO; A), suprachiasmatic-periventricular areas (Pe; B), retrochiasmatic-anterior hypothalamus area (C), and arcuate nucleus (ARC; D). Shown are the distribution patterns of TH-immunoreactive (diamonds) and fluorogold-labeled (circles) cells, their colocalization (circles in diamonds), and those dopaminergic (filled diamonds) and/or neuroendocrine (filled circles) cells that were found to be targets of IGL efferents. ac, Anterior commissure; oc, optic chiasm; Pe, periventricular area; f, fornix; V, third ventricle; mt, mammillothalamic tract;ZI, zona incerta; ot, optic tract;SO, supraoptic nucleus; DMH, dorsomedial hypothalamic nucleus.