Ultrastructure of German Mast excavation tongue. A, cross-sectional SEM view of the apex: ce, Keratimized cpithelium; ap, apex; ct, cartilago. B,C, corpus part: e, para creatimized ridge; d, surface epitholuim, b, papilla linguales; d, surface epitheluim. D, E, radix part: b, papilla linguales caudales; C, papilla filiformes, (a) Papilla conicae, (b) Papilla linguales caudales, (r) Radix.