From the auditory nuclei in the brain stem impulses are transmitted to the inferior colliculus and medial geniculate body of both sides through the trapezoid body and the lateral lemnisci. From there they reach the auditory cortex via the auditory radiations.
Inferior colliculus – lateral lemniscus - medial geniculate body
From the cerebellopontine angle the vestibulocochlear nerve enters the internal acoustic meatus along with the facial nerve (the trigeminal nerve does not pass through the cerebellopontine angle). In the inner ear it innervates the maculae of the utricle and saccule as well as the cristae of the semicircular ducts.
The vestibular ganglion is associated with the vestibular nerve whereas the spiral ganglion is a part of the cochlear nerve which innervates the organ of Corti.
The auditory pathway from the inner ear to the auditory cortex is via the lateral lemniscus, inferior colliculus, medial geniculate body and auditory radiation.
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