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Auditory Neurons with Transitory Axons to Visual Areas Form Short Permanent Projections.

Stephanie Clarke1, Giorgio M. Innocenti

  • 1Institute of Anatomy, University of Lausanne, rue du Bugnon 9, 1005 Lausanne, Switzerland.

The European Journal of Neuroscience
|January 1, 1990
PubMed
Summary
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Kitten auditory cortex neurons eliminate transient visual projections and form short permanent connections within the ipsilateral hemisphere. These neurons do not project to the contralateral hemisphere after losing their juvenile connections.

Area of Science:

  • Neuroscience
  • Developmental Neuroscience
  • Auditory and Visual System Development

Background:

  • Kitten auditory cortex (AI, AII) neurons initially project transiently to visual areas 17 and 18.
  • These transient axons are eliminated by the end of the first postnatal month.
  • The projection targets of these neurons after axon elimination remain unclear.

Purpose of the Study:

  • To investigate the projection targets of auditory cortex neurons after the elimination of their transient axons to visual areas.
  • To determine if these neurons project to the contralateral hemisphere or form new connections within the ipsilateral hemisphere.

Main Methods:

  • Early (postnatal day 2-5) and late (postnatal day 35-64) injections of retrograde fluorescent tracers were used in eighteen kittens.

Related Experiment Videos

  • Tracer injections were targeted to visual areas 17 and 18 (early) and auditory, visual, and association areas (late).
  • The middle ectosylvian gyrus (AI, AII) was analyzed for double-labeled neurons.

    • Main Results:

    • Late injections in the contralateral hemisphere did not relabel neurons with prior transient projections.
    • Late injections in the ipsilateral hemisphere, particularly in the middle ectosylvian gyrus, relabeled a percentage of these neurons.
    • Relabeled neurons were found to form short permanent cortical connections, primarily within the ipsilateral hemisphere.

    Conclusions:

    • Auditory cortex neurons that transiently project to visual areas establish short permanent connections within the ipsilateral hemisphere.
    • These neurons do not project to the contralateral hemisphere after eliminating their juvenile axonal projections.
    • This developmental pattern is similar to that observed in medial area 17 neurons.