Fig. 7
From: Functional morphological study on the tongue of the adult Egyptian geese (Alopochen egyptiacus)
Light micrographs of cross paraffin sections (A-G) showing structure of the apex at level of two ventrolateral mucosal projections (A & C) and rostral part of lingual body (B & D-G). Photos (A, B & D-F) stained with H&E, (C) with Masson’s Trichrome and (G) with PAS/Alcian blue. Note, dorsal epithelium (DE), entoglossum (E), two mucosal projections (blue arrow), median groove (black arrow), nerve endings (n), rounded papillae (rp), marginal lingual papillae (P), secondary small papillae (sp), rostral lingual s.g (RLsg), adipose tissue (Ad), mucous cells positive for PAS (black arrow heads) and mucous cells positive for Alcian blue (red arrow head)