Fig. 11
From: Functional morphological study on the tongue of the adult Egyptian geese (Alopochen egyptiacus)
Light micrographs of cross paraffin sections (A-F) of the lingual salivary glands showing the structure of secretory units and transformation of the ductal epithelium from mucous secreting cells to stratified squamous epithelium. All photos stained with H&E (A-F). Note, epithelium (EP), submucosa (SM), entoglossum (E), lingual salivary glands (Lsg), mucous producing cells (black arrow heads), extralobular duct (d), intralobular duct (blue arrow), stratified columnar epithelium (black arrow stratified cuboidal epithelium. (red arrow), stratified squamous epithelium (green arrow) and secretion (S)