Figure 1.

The habenula in the rhesus monkey. Top, The monkey's brain viewed from the mesial side. The location of the habenula is indicated by a red circle. C, Caudate nucleus; Th, thalamus; SC, superior colliculus; IC, inferior colliculus. Scale bar, 5 mm × 2. Bottom, A coronal histological section showing the habenula (red circle). The medially located dark region corresponds to the MHb, whereas the lateral part corresponds to the LHb. The vertical extent of this section corresponds to a violet line in the top figure. MD, Mediodorsal nucleus of the thalamus; Pul, pulvinar; PT, pretectum; N3, oculomotor nucleus; hc, habenular commissure; pc, posterior commissure. Scale bar, 1 mm × 5. This figure was reprinted with permission from Hikosaka (2007a), his Figure 1.