1 — Lesser wing; 2 — Sphenoidal crest; 3 — Opening of sphenoidal sinus; 4 — Superior orbital fissure; 5 — Orbital surface; 6 — Temporal surface; 7 — Foramen rotundum; 8 — Pterygoid canal; 9 — Pterygoid fossa; 10 — Pterygoid hamulus; 11 — Pterygoid process, medial plate; 12 — Pterygoid process, lateral plate; 13 — Foramen spinosum; 14 — Foramen ovale; 15 — Greater wing; 16 — Body of sphenoid
