Fourth, several nuclei of the hypothalamus project to the BSTvl; these inputs originate from the medial preoptic region (Figs. 4D,E, 5C), arcuate nucleus (Figs. 4G–J, 5I), dorsomedial hypothalamic nucleus (Fig. 4H,I), lateral hypothalamic area (Figs. 4F–L, 7D), parasubthalamic nucleus in the dorsolateral hypothalamus (Figs. 4K,L, 5H), and posterior hypothalamic nucleus (Fig. 4K,L). Collator note: see Figure 4D-E. In Figure 4, the level of the injection site, the entire part of the tissue, which is medial to BSTvl, is labeled more or less uniformly, with a "halo" of intense signal just around the nucleus (BSTdm and fu). See Atlas Levels 19-20 for MPN subnuclei.