Facial Weakness

Superior vestibular nucleus

V nucleus and tract

VII nerve

VII nerve

---Medial lemniscus

VI nucleus i

Related anatomy

The facial (VII) nerve contains mainly motor fibres supplying the muscles of facial expression, but also visceral efferent (parasympathetic) and visceral afferent (taste) fibres.

The motor nucleus lies in the lower pons medial to the descending nucleus and tract of the Vth cranial nerve. Axons from the motor nucleus wind around the nucleus of the Vlth cranial nerve. The facial nerve and its visceral root (nervus intermedins) exit from the lateral aspect of the brain stem and cross the cerebellopontine angle immediately adjacent to the VIII cranial nerve. They enter the internal auditory meatus and, passing through the facial canal of the temporal bone, lie in close proximity to the inner ear and tympanic membrane. The facial nerve gives off several branches before exiting from the skull through the stylomastoid foramen.

---Medial lemniscus

Cortico-spinal tract

Internal auditory meatus /

Nervus intermedius

VIII nerve "

Greater superficial petrosal nerve

Internal auditory meatus /

Greater superficial petrosal nerve

Mastoid air cells

VIII nerve "

stapedius

Chorda tympani nerve stapedius

Chorda tympani nerve

Mastoid air cells

Facial nerve emerging from base of skull at stylomastoid foramen

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