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Summary The Facial Nerve (CN VII) $3.87
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Summary The Facial Nerve (CN VII)

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This is a summary of the anatomy and functions associated with the Facial Nerve (CN VII)

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  • November 16, 2015
  • 5
  • 2015/2016
  • Summary
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The Facial Nerve (CN VII)


 The facial nerve innervates structures that are derivatives of the second
pharyngeal arch
 Its functions include:

Motor – acts to innervate the muscles of facial expression, the posterior belly
of digastric, the stylohyoid and the stapedius muscles

Special sensory – provides taste sensation to the anterior 2/3 of the tongue

Parasympathetic – supplies many glands located in the head and neck
including: submandibular, sublingual, nasal, palatine, lacrimal and pharyngeal
glands




Anatomical course:
 Anatomically, the facial nerve can be split into to pathways:
1. Intracranial – through the cranial cavity and cranium
2. Extracranial – outside the cranium, through the face and neck

Intracranial course –
 The facial nerve starts at the pons (facial nucleus) and begins as two roots: a
large motor root, and a small sensory root (also known as the intermediate
nerve)
 Both roots pass through the internal acoustic meatus in the petrous part of
the temporal bone, here they are very close to the inner ear
 Within the temporal bone, the roots pass out of the internal acoustic meatus
and enter the facial canal

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