Anterior (a) to posterior (d) coronal aspects of the sheep claustrum. Fresh coronal blocks (first row a1 to d1; scale bar =5 mm); MRI digital sections (second row, scale bar =1 cm); Cresyl‐violet staining (third row; scale bar =2 mm). Cl (cl) outline is drawn by red lines. a, amygdala; aha, amygdalohippocampal area; c, caudate; cp, caudoputamen; Ex, external capsule; Ext, extreme capsule; p, putamen