Intracranial course and branches Fig 111

• From cerebellopontine angle, crosses posterior cranial fossa, enters internal acoustic meatus (IAM; with VIII).

• Nervus intermedius joins main root of facial nerve in IAM.

Pterygopalatine ganglion

Maxillary nerve in foramen rotundum

Eustachian tube

Canal for tensor tympani

Lingual nerve, submandibular ganglion

Maxillary nerve in foramen rotundum

Facial Canal Internal Acoustic Meatus

Fig. 11.1 Facial nerve (intracranial).

Nervus intermedius Facial canal on medial wall of tympanic cavity

Fig. 11.1 Facial nerve (intracranial).

VII at stylomastoid foramen branchiomotor fibres from facial motor nucleus to muscles of facial expression, stapedius, etc.; §" * : parasympathetic preganglionic fibres from superior salivatory nucleus; Q—: nucleus of solitary tract receiving visceral sensory fibres, cell bodies in geniculate (sensory) ganglion; * to stapedius; stippled area represents bone.

• Geniculate ganglion is deep in IAM: this houses cell bodies of sensory fibres (no synapses) in VII. Nerve turns posteriorly into:

• Facial canal running posteriorly along medial wall of tympanic (middle ear) cavity, and gives branch to stapedius (attached to stapes);

Stylomastoid Foramen

Marginal mandibular (vulnerable here)

Fig. 11.2 Facial nerve (extracranial).

Marginal mandibular (vulnerable here)

Fig. 11.2 Facial nerve (extracranial).

• Chorda tympani given off just before VII emerges at stylomastoid foramen; this passes anteriorly across tympanic membrane into infratemporal fossa where it joins lingual nerve;

• Emerges at stylomastoid foramen.

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  • Harding
    Where is the stylomastoid foramen?
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