The information is integrated and the medial geniculate nucleus projects that information to the auditory cortex in the temporal lobe of the cerebral cortex. The medial geniculate nucleus of the thalamus then receives the auditory information from the three brainstem nuclei. Pathophysiological changes in the IC can alter all aspects of auditory perception and aid in localization of sound. The information is decoded and integrated by each relay nucleus in the pathway and finally projected to the auditory cortex. The IC is also a point of convergence for corticofugal (information from the cerebral cortex) input and input originating outside the auditory pathway. The auditory pathway starts at the cochlear nucleus, then the superior olivary complex, then the inferior colliculus, and finally the medial geniculate nucleus. The inferior colliculus (IC) is a midbrain structure that integrates the vast majority of ascending auditory information and projects via the thalamus to the auditory cortex. This begins the process of sound localization through estimating time difference and intensity between each ear (Christov, Nelson, & Gluth 2018).Īfter the superior olivary nucleus, auditory processing continues on to a nucleus called the inferior colliculus (IC). The superior olivary nucleus takes the information from the cochlear nucleus and begins the process of interpreting and combing information. The next part of the ascending process of auditory information in the brainstem is the superior olivary nucleus. The auditory pathway starts at the cochlear nucleus, then the superior olivary complex, then the inferior colliculus, and finally the medial geniculate nucleus. Schematic figure of the auditory neural pathway. The input received in the cochlear nuclei is only from one side of the body.įig.6.10.1. The cochlear nuclei receives information from the cochlea. Auditory (Hearing) System The auditory pathway processes sound information as it travels from the ear to the brain so that our brain pathways are part of our hearing. Audition begins by traveling along the vestibulocochlear nerve, which synapses with neurons in the cochlear nuclei of the superior medulla. Auditory (ear) Nerve This nerve sends sound information from the ear to the brain. The sensory pathway of audition ascends through three brainstem nuclei. Understand the role of the medial geniculate nucleus.Ī sensory pathway that carries peripheral sensations to the brain is referred to as an ascending pathway, or ascending tract. Know the three different brainstem nuclei.
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