Fig. 7.

Example of parts of experimental sections used to transfer data to a reference Atlas Level. The derivation of this trapezoidal grid is illustrated in Figure 6 with plane of section data from Figure 4. Note that at this transverse level of the PVH (Atlas Level 25), data from 4 experimental sections (15 μm-thick, spaced 45 μm apart; B1-B4) is transferred systematically to Atlas Level 25. The number of elements in the grid is proportional to the difference in plane of section (Fig. 3) and would equal one for an experimental section cut in exactly the same plane as the reference atlas and exactly overlying the Atlas Level. The PVH is outlined with dashed lines; the small part in the upper right that is detached from the main body of the nucleus at this level is the lateral tail of the dorsal zone of the medial parvicellular part (Simmons and Swanson, 2008). The heavy black line to the left indicates the wall of the third ventricle.