Vestibulocochlear nerve (CN VIII)
The vestibulocochlear nerve is the eighth cranial nerve and has two roles:
It emerges between the pons and the medulla lateral to the facial nerve and nervus intermedius, passing laterally through the cerebellopontine angle to the internal acoustic meatus (IAM) with the aforementioned two other nerves.
In the IAM the nerve splits into 4 bundles: cochlear nerve, superior and inferior division of the vestibular nerve and nerve from the posterior semicircular canal, separated from each other by the falciform crest and Bill's bar. (see figure 2).
- The superior division of the vestibular nerve carries sensory fibres from the hair cells of the anterior and lateral semicircular canals and utricle. It is located in the posterosuperior quadrant.
- The inferior division carries sensory fibres from the saccule. It is located in the posteroinferior quadrant, along with;
- The nerve from the posterior semicircular canal, also in the posteroinferior quadrant passes through the foramen singulare
- Last's Anatomy - 10th Edition - Chummy S Sinnatamby
- Clemete's Anatomy - Regional Atlas of the Human Body - 3rd Edition