Locations of neurogenesis marker expression in the anterior commissure, fornix, septal area and corpus callosum. The larger picture is the image of a specimen obtained from the parasagittal section shown in Figure 11. Upper and lower insets on the right display hematoxylin-eosin (HE) and GFAP staining, respectively, of sections from this specimen where the anterior commissure (ac) is present. Part of the septal area (sa) corresponds to the paraterminal gyrus (pt) identified in the gross anatomy. These sections contain the subfornical organ (sfo), another circumventricular organ. In the lower inset, blue and red depict DAPI (nuclei) and GFAP staining, respectively. (ac), anterior commissure; (bf), body of the fornix; (cc), corpus callosum; (cf), column of the fornix; (chf) choroidal fissure; (cp), choroid plexus; (cs), callosal sulcus; (fm), foramen of Monro; (hs), hypothalamic sulcus; (pcf), post-commissural fornix; (sp), septum pellucidum; (th), thalamus; (tms), thalamic medial striae. Numbers indicate boxes that correspond to the locations of the following Figures: (1), 22 A–D; (2), 22 E–H; (3), 21 A–C; (4) 21 D–F; (5), 21 G–I; (6), 20 A–C; (7), 20 D–F; (8) 20 G–I. Scale bars: 5,000 μm.