1 — Oral vestibule; 2 — Oral cavity proper; 3 — Isthmus of fauces; Oropharyngeal isthmus; 4 — Palatopharyngeal arch; Posterior pillar of fauces; 5 — Palatoglossal arch; Anterior pillar of fauces; 6 — Oral vestibule; 7 — Upper lip; 8 — Frenulum of upper lip; 9 — Hard palate; 10 — Soft palate; 11 — Uvula; 12 — Palatine tonsil; 13 — Dorsum of tongue; 14 — Frenulum of lower lip; 15 — Lower lip; 16 — Muscles of oral floor; 17 — Mandible; 18 — Tongue; 19 — Nasal septum; 20 — Torus tubarius; 21 — Hyoid bone; 22 — Epiglottis
