(a) Apex-corpus view of the tongue ( 6-7 weeks). Triple stain 40x; 200x; 400x. (b) Corpus- radix view ventral surface of the tongue (studs). Alcian blue stain 200x. (c) Apex-corpus view of the tongue (studs). Triple stain 100x. (d) Apex view of the tongue (9-13 weeks). Triple stain, Scale bars: 200µm. vs)ventral surface of the tongue; ds) dorsal surface of the tongue; at) apex of tongue; oke) orthokeratinized stratified epithelium; pke) parakeratinized epithelium; lp) lamina propria; bl)basal layer; ıl)intermediate layer; kl)keratinized layer; Hk) Hyaline cartilage; mp) microscobic papillae; Mb)Mucous glands.