Cranial Foramina

Foramen	Structures Conducted	Cranial Fossa	Cranial Bone
Cribriform foramina in cribriform plate	Olfactory nerve (CN I) Anterior ethmoidal nerves	Anterior cranial fossa	Ethmoid bone
Optic canal	Optic nerve (CN II) Ophthalmic artery	Middle cranial fossa	Sphenoid bone
Superior orbital fissure	Lacrimal nerve Frontal nerve- branch of ophthalmic nerve of trigeminal nerve (CN V) Superior ophthalmic vein Trochlear nerve (CN IV) Superior division of the oculomotor nerve (CN III) Nasociliary nerve- branch of ophthalmic nerve (CN V1) Inferior division of the oculomotor nerve (CN III) Abducens nerve (CN VI) A branch of the Inferior ophthalmic vein	Middle cranial fossa	Sphenoid bone
Foramen rotundum	Maxillary branch of trigeminal nerve (CN V)	Middle cranial fossa	Sphenoid bone
Foramen ovale	Mandibular branch of trigeminal nerve (CN V)	Middle cranial fossa	Sphenoid bone
Foramen spinosum	Middle meningeal artery Middle meningeal vein Meningeal branch of CN V3	Middle cranial fossa	Sphenoid bone
Internal acoustic meatus	Facial nerve (CN VII) Vestibulocochlear nerve (CN VIII) Vestibular ganglion Labyrinthine artery	Middle cranial fossa	Petrous part of temporal bone
Jugular foramen	Glossopharyngeal nerve (CN IX) Vagus nerve (CN X) Accessory nerve (CN XI) Jugular bulb Inferior petrosal and sigmoid sinuses	Posterior cranial fossa	Anterior aspect: Petrous portion of the temporal Posterior aspect: Occipital bone
Hypoglossal canal	Hypoglossal nerve (CN XII)	Posterior cranial fossa	Occipital bone
Foramen magnum	Vertebral arteries Medulla and meninges CN XI (spinal division) Dural veins Anterior and posterior spinal arteries	Posterior cranial fossa	Occipital bone