This article discusses the anatomy of
the auditory pathway (see the following images), as well as a few
physiologic considerations and clinical applications.
Illustration of the auditory reflex pathway. 
Illustration of the conscious auditory pathway. Anatomy of the auditory system. Courtesy of Hamid R Djalilian, MD. The
eighth cranial nerve (CN VIII) or vestibulocochlear nerve is composed
of 2 different sets of fibers: (1) the cochlear nerve and (2) the
vestibular nerve. These 2 nerves are anatomically and physiologically
different. The peripheral segments of the cochlear and vestibular nerves
join at the lateral part of the internal auditory canal (IAC) to form
the vestibulocochlear nerve. They are also joined by the facial nerve in
the IAC. The length of the vestibulocochlear nerve, from the
glial-Schwann junction to the brainstem, is 10-13 mm in the human male
and 7-10 mm in females.
Illustration of the auditory reflex pathway. Illustration of the conscious auditory pathway. Anatomy of the auditory system. Courtesy of Hamid R Djalilian, MD. The
eighth cranial nerve (CN VIII) or vestibulocochlear nerve is composed
of 2 different sets of fibers: (1) the cochlear nerve and (2) the
vestibular nerve. These 2 nerves are anatomically and physiologically
different. The peripheral segments of the cochlear and vestibular nerves
join at the lateral part of the internal auditory canal (IAC) to form
the vestibulocochlear nerve. They are also joined by the facial nerve in
the IAC. The length of the vestibulocochlear nerve, from the
glial-Schwann junction to the brainstem, is 10-13 mm in the human male
and 7-10 mm in females.
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