facial nerve : anatomy and lesions

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Facial Nerve - CN VII anatomy & lesions:

Facial Nerve - CN VII anatomy & lesions Prepared by : Belal

Facial nerve (Cranial nerve 7):

Facial nerve (Cranial nerve 7) Has five intracranial segments: Nucleus facialis and pontine segment. Intracanalicular segment Labyrinthine segment Tympanic segment (horizontal) Mastoid segment (vertical) Then its emerges from the stylomasotid foramen and gives the extra-cranial segment 2


The extra-cranial part 1. Posterior auricular nerve . 2. Branches to the post belly of the digastric and the stylohyoid muscles 3. Five terminal branches : within the substance of the parotid gland it divides into the terminal branches to the mimic muscles of the face 3


Terminal branches: Temporal Zygomatic Buccal Mandibular Cervical 4

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Facial nerve paralysis:

Facial nerve paralysis Lower motor neuron lesions Internal auditory canal tumor Middle ear infection, trauma or surgery Bell’s palsy: neuritis within the facial nerve canal Parotid gland tumor Lacerations of the face All the muscles of that side will be affected 8

Facial nerve paralysis:

Facial nerve paralysis Upper motor neuron lesions Involvement of the pyramidal tract The upper part of the face stays normal because the neurons supplying this part of the face receive corticobulbar fibers from both cerebral cortices. 9

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Testing :

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