Fig. 2.

Architectonic boundaries of the caudal hypothalamus in the adult rhesus monkey show developmental origin of anatomical landmarks and hypothalamic nuclei. a, c, e, g Photomicrographs of coronal sections through the hypothalamus of an adult rhesus monkey stained for AChE; b, d, f, h maps of traced architectonic boundaries. Sections are ordered sequentially from caudal a, b to rostral g, h. All nuclei of the caudal hypothalamus are likely of basal plate origin. The SM, the PM, the STN, and the PeM are likely derived from hp1 while the MM and the LM likely arise from hp2. Calibration bar (2 mm) in g applies to a, c, e, and g. For color code see Fig. 1. See list of abbreviations for complete terms