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MSUCOM HN 1B
What enters & exits cranial cavities
| Question | Answer |
|---|---|
| Foramen ovale | Mandibular branch (V3) or trigeminal (CN5) Lesser superficial petrosal nerve (CN9) |
| Foramen spinosum | Middle menigial artery |
| Pterygomaxillary fissure | Descending palatine a. |
| Pterygopalatine fossa | Descending palatine a. |
| Sphenopalatine foramen | Sphenopalatine a. |
| Foramen rotundum | Maxillary branch (V2) of trigeminal (CN5) |
| Sella turnica | Fossa for pituitary gland |
| Stylodmastoid foramen | Facial n. (CN7) |
| Jugular foramen (7) | Inferior petrosal sinus Sigmoid sinus Jugular bulb Internal jugular vein Glossopharyngeal, vagus, accessory nn. (CN9,10,11) |
| Carotid canal | Internal carotid artery and plexus |
| Petrotympanic fissure | Auriculotemporal n. (branch of maxillary (V3) of trigeminal (CN5) |
| Musculotubal canal | Eustatian tube |
| Internal auditory meatus (3) | Facial n. (CN7) Auditory n. (CN8) Labyrinthine a. |
| Cribiform plate | Olfactory n. (CN1) |
| Foramen magnum (4) | Border between spine & brain stem Spinal cord Cervical part of CN11 Vertebral a. Vertebral venous plexus |
| Condylar canals | Emissary vein from sigmoid sinus to vertebral veins in neck |
| Hypoglossal canal | Hypoglossal n. (CN12) |
| Foramen lacerum | Carotid artery crosses close by, usually filled with cartilage in situ |
| Supraorbital foramen | Supraorbital n. & a. |
| Optic canal (2) | Optic n. Opthamilic artery |
| Superior orbital fissure (5) | Opthalmic v. (superior) Oculomotor n. (CN3) Trochlear n. (CN4) Ophthalmic n. (CN5-1) Abducens n. (CN6) |
| Inferior orbital fissure | Inferior opthalmic vv. |
| Infraorbital foramen/canal | Infraorbital n. |
| Mandibular foramen | Enterance: Inferior alveolar n. (CN5) |
| Mental foramen | Exit: Mental n. |
| Greater & lesser foramina | Greater & lesser palatine arteries |
| Incisive foramen | Anastamosis between posterior septal branch of sphenopalatine artery & greater palatine a. |
| Zygomaticotemporal foramen | Maxillary artery lies deep to these |