Where does the facial nerve exit the skull?

The facial nerve (CN VII) passes through the internal acoustic meatus and exits the skull via the stylomastoid foramen after traversing the facial canal. Injury at different segments produces distinct motor and sensory deficits.

Chapter 5 of 5 - Anatomy Course

Head, Neck & Neuroanatomy

The skull protects the brain and houses special senses. Cranial nerves exit through named foramina; the neck carries major vessels and the airway from thorax to cranial base.

Integrated questions link pupil size, gaze palsies, and facial weakness to segmental anatomy - know the skull base map and brainstem crossings.

Skull Base and Foramina

Each cranial nerve has a predictable course: optic (II) through the optic canal, maxillary (V2) via foramen rotundum, mandibular (V3) via foramen ovale, and so on. Masses, fractures, and infiltrative processes produce syndromes by structure at each opening.

Cranial nerve rapid screen

Smell (I)

Olfactory filaments - trauma, meningioma patterns.

Vision (II)

Optic nerve, chiasm, tract - field cuts.

Eye movements (III, IV, VI)

Ptosis, diplopia, strabismus localizations.

Face sensation & motor (V, VII)

Trigeminal divisions; facial nerve motor branches.

Illustration of the twelve cranial nerves emerging from the brainstem and skull base — Memorize cranial nerve numbers and functions first; then attach each to skull base exit and clinical deficit patterns.
Blausen Medical Gallery 2014, Wikimedia Commons, CC BY 3.0
Source

Molecular Structure

Acetylcholine

Cholinergic synapses at the neuromuscular junction and parasympathetic terminals tie molecular signaling to the motor and autonomic patterns you localize on exam.

Formula

C₇H₁₆NO₂

Mol. Weight

145.21 g/mol

View on PubChem

Meninges and Venous Sinuses

The dura mater has periosteal and meningeal layers; arachnoid bridges subarachnoid CSF spaces; pia adheres to brain. Epidural versus subdural bleeds differ by vessel source and bridging vein involvement - classic board contrast.

Space	Key idea
Subarachnoid	CSF, circle of Willis, aneurysmal rupture patterns
Epidural	Arterial (middle meningeal) lens-shaped on imaging classically
Subdural	Bridging veins; crescentic collection; elderly, alcohol use

Quick Check

Which cranial nerve carries parasympathetic fibers to the pupil sphincter and ciliary body?

Fill in the Blank

The meningeal layer directly adherent to the surface of the brain is the________ mater.

From weakness pattern to level

Upper versus lower motor neuron signs

Tone, reflexes, atrophy patterns.

Crossed versus uncrossed deficits

Brainstem lesions often show ipsilateral face, contralateral body.

Map to artery or nerve

MCA stroke versus peripheral VII palsy.

Was this helpful? Rate it!

←Previous: Pelvis & Perineum Next section: Anatomy Game→

Create a free Lorea account

Turn your notes into courses, practice tests, study games, and narrated videos - or build full interactive study worlds - then publish, download, and share them however you like.