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Second order auditory pathways in the chimpanzee

N L Strominger, L R Nelson, W J Dougherty

    The Journal of Comparative Neurology
    |March 15, 1977
    PubMed
    Summary
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    Unilateral aspiration of cochlear nuclei in a chimpanzee revealed auditory pathway degeneration. Findings map ascending auditory projections in the great ape brain, highlighting a potential phylogenetic advance.

    Area of Science:

    • Neuroscience
    • Auditory System Research
    • Primate Neuroanatomy

    Background:

    • The auditory pathway's complex neural circuitry is crucial for sound processing.
    • Understanding ascending auditory projections in primates provides insights into auditory system evolution.

    Purpose of the Study:

    • To investigate the central projections of the anteroventral (Av) cochlear nucleus in a chimpanzee.
    • To map the degeneration of second-order auditory fibers following aspiration lesions.

    Main Methods:

    • Unilateral aspiration of cochlear nuclei (dorsal, posteroventral, anteroventral) in a chimpanzee.
    • Axonal degeneration tracing using the Fink-Heimer method.

    Main Results:

    • Degeneration predominantly followed the lateral trapezoid body, dorsal and intermediate acoustic striae.

    Related Experiment Videos

  • Projections were observed in the superior olivary complex (ipsilateral lateral, bilateral medial), contralateral medial trapezoid nucleus, and bilateral retro-olivary/preolivary groups.
  • Significant degeneration reached the contralateral lateral lemniscus (ventral nucleus) and central nucleus of the inferior colliculus.
  • Ascending fibers in the contralateral brachium of the inferior colliculus projected to the medial geniculate body.

    • Conclusions:

    • The study details the central auditory pathway's organization in a chimpanzee.
    • Identified projections suggest a complex auditory processing network in great apes.
    • The observed pathway to the medial geniculate body may represent a phylogenetic advancement in auditory processing.