All cranial nerves and the foramina where they pass from also tell nam

All cranial nerves and the foramina where they pass from also tell name of bones of which foramen is part of

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cranial nerves foramina skull passage bones

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cranial nerves foramina skull base diagram

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Here is a comprehensive table of all 12 cranial nerves, their exit foramina, and the bones that form each foramen:

All 12 Cranial Nerves — Foramina & Bones

CN	Name	Foramen / Opening	Bones Forming the Foramen
I	Olfactory	Cribriform plate foramina (multiple small holes)	Ethmoid bone (cribriform plate)
II	Optic	Optic canal	Sphenoid bone (lesser wing / body)
III	Oculomotor	Superior orbital fissure	Sphenoid bone (greater wing + lesser wing)
IV	Trochlear	Superior orbital fissure	Sphenoid bone (greater wing + lesser wing)
V₁	Trigeminal – Ophthalmic	Superior orbital fissure	Sphenoid bone (greater wing + lesser wing)
V₂	Trigeminal – Maxillary	Foramen rotundum	Sphenoid bone (greater wing / body)
V₃	Trigeminal – Mandibular	Foramen ovale	Sphenoid bone (greater wing)
VI	Abducens	Superior orbital fissure	Sphenoid bone (greater wing + lesser wing)
VII	Facial	Internal acoustic meatus → Stylomastoid foramen	Internal acoustic meatus: Temporal bone (petrous part); Stylomastoid foramen: Temporal bone (between mastoid & styloid processes)
VIII	Vestibulocochlear	Internal acoustic meatus	Temporal bone (petrous part)
IX	Glossopharyngeal	Jugular foramen	Temporal bone (petrous part) + Occipital bone
X	Vagus	Jugular foramen	Temporal bone (petrous part) + Occipital bone
XI	Accessory (Spinal)	Jugular foramen (exits); spinal root enters via Foramen magnum	Jugular foramen: Temporal bone + Occipital bone; Foramen magnum: Occipital bone
XII	Hypoglossal	Hypoglossal canal	Occipital bone

Key Foramina — Summary by Location

Superior Orbital Fissure

CN III, IV, V₁, VI all pass through here
Formed entirely by the sphenoid bone (gap between greater and lesser wings)

Optic Canal

CN II only
Formed by the lesser wing and body of the sphenoid bone

Foramen Rotundum

CN V₂ (maxillary nerve)
Entirely within the greater wing of the sphenoid

Foramen Ovale

CN V₃ (mandibular nerve); also lesser petrosal nerve and accessory meningeal artery
Entirely within the greater wing of the sphenoid

Foramen Spinosum (no cranial nerve, but nearby)

Middle meningeal artery — sphenoid bone

Cribriform Plate

Multiple tiny foramina for CN I (olfactory nerve filaments)
Part of the ethmoid bone

Internal Acoustic Meatus (IAM)

CN VII + CN VIII
Petrous part of the temporal bone

Stylomastoid Foramen

CN VII exits the skull here after traversing the facial canal
Temporal bone (between the base of the styloid process and the mastoid process)

Jugular Foramen

CN IX, X, XI (+ internal jugular vein, inferior petrosal sinus)
Posterior border: Occipital bone
Anterior border: Petrous part of temporal bone

Hypoglossal Canal

CN XII
Occipital bone (anterolateral to foramen magnum)

Foramen Magnum

CN XI (spinal root ascends through it), brainstem/spinal cord junction, vertebral arteries
Occipital bone

Mnemonic for Foramina at a Glance

Foramen	Mnemonic Nerve(s)
Cribriform plate	I — "I smell"
Optic canal	II — "I see"
Superior orbital fissure	III, IV, V₁, VI — "3, 4, 5-one, 6 through the fissure"
Foramen rotundum	V₂ — "Rotund cheek (maxilla)"
Foramen ovale	V₃ — "Oval jaw (mandible)"
IAM → Stylomastoid	VII, VIII — "Facial + hearing, same meatus"
Jugular foramen	IX, X, XI — "9-10-11 jugular"
Hypoglossal canal	XII — "Hypo = XII"

Key Bones Involved (Summary)

Bone	Cranial Nerves Passing Through Its Foramina
Ethmoid	CN I
Sphenoid	CN II, III, IV, V₁, V₂, V₃, VI
Temporal	CN VII, VIII, IX, X, XI
Occipital	CN IX, X, XI, XII

Note: CN IX, X, XI pass through the jugular foramen, which is a joint foramen between the temporal and occipital bones, so both bones share credit for those nerves.

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