I — Maxilla, palatine process; 2 — Palatine bone, horizontal plate; 3 — Posterior process; Sphenoid process; 4 — Choana; Posterior nasal aperture; 5 — Vomer; 6 — Sphenoidal crest; 7 — Hypophysial fossa; 8 — Sphenoidal sinus; 9 — Cribriform plate; 10 — Anterior cranial fossa;
II — Frontal sinus; 12 — Crista galli; 13 — Nasal bone; 14 — Ethmoid; Ethmoidal bone, perpendicular plate; 15 — Septal nasal cartilage;
16 — Major alar cartilage, medial crus; 17 — Nasal crest; 18 — Incisive canal; 19 — Oral cavity
