|| The final neuron
of the primary auditory pathway links the thalamus to the auditory
cortex, where the message, already largely decoded during its passage
through the previous neurons in the pathway, is recognised, memorised
and perhaps integrated into a voluntary response.
| A final
relay, before the cortex, occurs in the thalamus (median geniculate
body); genouillé médian)it's here that an important
integration occurs: preparation of a motor response (eg vocal response).
| Leaving this relay,
a third neuron carries the mesage up to the level of the mesencephalus
(superior colliculus). These two relays play an essential rôle
in the localisation of sound.
second major relay in the brain stem is in the superior olivary
complex: the majority of the auditory fibres synapse there having
already crossed the midline.
| The first relay of
the primary auditory pathway occurs in the cochlear nuclei in the
brain stem, which receive Type I spiral ganglion axons (auditory
nerve); at this level an important decoding of the basic signal
occurs: duration, intensity and frequency.