Figure 23.

Complementary Calca (red) and Pdyn (blue) patterns in the caudal diencephalon. (a) Calca projections target the VPpc and the parasubthalamic nucleus (PSTN). The thalamic parafascicular nucleus (PF) contained light labeling, with lighter, scattered labeling in the posterior thalamic midline. (b) Pdyn projections also lightly innervate this midline region near the midbrain-diencephalic junction. Ventrally, Pdyn projections produce a moderately dense terminal field in the posterior Arc, and similar to Calca projections, also densely innervate a part of the far-lateral, caudal LHA near the cerebral peduncle. However, the combined panel (c) shows that Calca labeling wraps closely over the cerebral peduncle and subthalamic nucleus, while Pdyn labeling is offset medially, further from the cerebral peduncle.