Figure 6

Differential expression of K-Channel genes in the direct vocal-motor pathway (HVC and RA). (A, E) Camera lucida drawings of a parasagittal section (~2.0 mm from the midline) depicting the dorso-caudal portion of the nidopallium, including song nucleus HVC (approximate location is indicated in Figure 1; HVC is indicated by arrowheads, ventricle is shaded in grey), and the ventro-caudal portion of the arcopallium and song nucleus RA. The location of a lamina is indicated by the dotted line; arrowheads delineate the approximate boundaries of HVC and RA; thin lines (in E) denote fibers of the occipitomesencephalic (OM) tract. In situ hybridization images for K-Channel genes reveal highly selective (positive or negative) markers of HVC (B-D) and RA (F-H). Scale-bar: 200 μm. See Abbreviations for a complete list of anatomical abbreviations.