Figure 1.

Representative staining from the ventral bank of the lateral fissure. Sections are at the level of the primary auditory cortex (AI) on the first transverse (Heschl's) gyrus. Sections were cut in the coronal plane. The sections in (A) and (E) are stained by the Gallyas silver stain for myelin while (B) and (F) are stained for Nissl substance. Section (C) was stained for cytochrome oxidase activity (CYO) while (D) was stained for NADH-diaphorase. As well as AI, several other areas can be identified in the first two panels and their borders are marked by arrows. These include the lateroposterior area (LP), the lateral area (LA), and the superior temporal area (STA). The later panels (C–F) all show sections through AI. The borders of cortical layers (defined by Nissl stain) are indicated by the horizontal lines and indicated by Roman numerals down to the white matter border (WM). This histological material was prepared for a previous study of the auditory cortex where the brain was fixed by perfusion through the internal carotid artery.