Auditory Nuclei, Auditory Pathway and Otosclerosis

by Craig Canby, PhD

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    The afferent fibers conveying information from the organ of Corti are going to convey this information to auditory nuclei. These will be the conductors of beautiful music or audition. There are several auditory nuclei that are conductors of audition. First, we have up here superiorly, the medial geniculate body. This is a thalamic nucleus. Another member of the auditory nuclei is the inferior colliculus that we see in through here. Third member is the nuclei that are associated with the lateral lemniscus. We also have cochlear nuclei in this area. Then we have the olivary nuclei. These are paired structures hence, plural. Now, I want you to understand the circuitry of the auditory pathway. First again will be depolarization of the cochlear hair cells in the cochlea. Action potentials will then be conveyed along the cochlear nerve fibers to the ipsilateral anterior cochlear nucleus. That has been highlighted here. From this nucleus, fibers then will travel to the superior olivary nucleus on the same and opposite sides. Here is the superior olivary nucleus on the same side receiving information from the auditory nucleus. Then there’s also signaling taking place to the superior olivary nucleus on the opposite side as well. Synapses occur within here. Then neurons will then travel through the lateral lemniscus from the cochlear and superior olivary nuclei. Their destination is to the inferior colliculus that we see here. Then from the inferior colliculus, there will be another neuron that will convey auditory information to the medial geniculate body of the thalamus. Then synapses within this body will send auditory signals to the primary auditory cortex which is associated with the transverse temporal gyrus that’s a part of the temporal lobe of the cerebrum. There can be some lesions associated along the auditory pathway that can impair hearing....

    About the Lecture

    The lecture Auditory Nuclei, Auditory Pathway and Otosclerosis by Craig Canby, PhD is from the course Auditory System and Vestibular System. It contains the following chapters:

    • Auditory Nuclei
    • Auditory Pathway
    • Otosclerosis

    Included Quiz Questions

    1. Ipsilateral anterior cochlear nucleus
    2. Contralateral superior olivary nucleus
    3. Medial geniculate body
    4. Superior olivary nucleus
    5. Lateral geniculate body
    1. Temporal lobe
    2. Parietal lobe
    3. Postcentral gyrus
    4. Occipital lobe
    5. Central sulcus
    1. Inability to locate the source of sound
    2. Inability to hear high frequency sounds only
    3. Inability to hear low frequency sounds only
    4. Conductive hearing loss on ipsilateral side
    5. Unilateral sensorineural hearing loss
    1. Poor transmission from external to middle ear
    2. Poor transmission from middle to inner ear
    3. Impacted wax
    4. Sensorineural hearing loss
    5. Fibrosis of hair cells

    Author of lecture Auditory Nuclei, Auditory Pathway and Otosclerosis

     Craig Canby, PhD

    Craig Canby, PhD

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