Representative brightfield photomicrographs of FoxP1 and FoxP2 mRNA expression patterns in a series of sagittal sections from one 2 h NS (left) and one 2 h UD (right) adult male Bengalese finch brain. Both medial and lateral sections are shown to enable display of the song control nuclei investigated here. (A) Nissl-stained sagittal sections. Locations of medial and lateral sections correspond to the level of sagittal plates 6 and 11, respectively, in the zebra finch atlas of Nixdorf-Bergweiler and Bischof (Nixdorf-Bergweiler and Bischof, 2007). (B) Schematic drawings based on the Nissl stains. A, arcopallium; Bas, basorostral pallial nucleus; HA, apical part of the hyperpallium; HD, densocellular part of the hyperpallium; LMAN, lateral magnocellular nucleus of anterior nidopallium; M, mesopallium; N, nidopallium; NC, caudal nidopallium; RA, robust nucleus of arcopallium; StL, lateral striatum; StM, medial striatum. (C) FoxP1 mRNA signals. (D) FoxP2 mRNA signals. Medial sections in A, C and D were adjacent or near adjacent to one another; similarly, lateral sections were adjacent or near adjacent. D, dorsal; C, caudal.