1 — Cranial dura mater; 2 — Cranial arachnoid mater; 3 — Cranial pia mater; 4 — Myelencephalon; Medulla oblongata; Bulb; 5 — Sigmoid sinus; 6 — Posterior meningeal artery; 7 — Basilar artery; 8 — Middle meningeal artery; 9 — Posterior cerebral artery, postcommunicating part; P2 segment; 10 — Venous plexus of foramen ovale; 11 — Internal carotid venous plexus; 12 — Superior ophthalmic vein; 13 — Internal carotid artery, cavernous part; 14 — Middle cerebral artery; 15 — Ophthalmic artery; 16 — Anterior cerebral artery, precommunicating part; A1 segment; 17 — Anterior cerebral artery, postcommunicating part; A2 segment; 18 — Anterior communicating artery; 19 — Pituitary gland; 20 — Cribriform foramina; 21 — Posterior cerebral artery, precommunicating part; P1 segment; 22 — Internal carotid artery, cerebral part; 23 — Optic canal; 24 — Posterior communicating artery; 25 — Anterior clinoid process; 26 — Superior orbital fissure; 27 — Posterior clinoid process; 28 — Foramen rotundum; 29 — Carotid sulcus; 30 — Foramen lacerum; 31 — Foramen ovale; 32 — Groove for middle meningeal artery; 33 — Foramen spinosum; 34 — Superior cerebellar artery; 35 — Labyrinthine artery; 36 — Jugular foramen; 37 — Anterior inferior cerebellar artery; 38 — Vertebral artery; 39 — Posterior inferior cerebellar artery; 40 — Subarachnoid space; Leptomeningeal space; 41 — Occipital sinus
