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Positional specificity of corneal nerves during development.

J A Bee, R A Hay, E M Lamb

    Investigative Ophthalmology & Visual Science
    |January 1, 1986
    PubMed
    Summary
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    Developing avian corneal nerves grow in specific patterns. Positional analysis reveals nerves follow defined pathways and branch in successive zones, indicating environmental guidance during development.

    Area of Science:

    • Developmental biology
    • Neuroscience
    • Ophthalmology

    Background:

    • The avian cornea develops with neurites extending from a nerve ring.
    • Understanding nerve guidance in development is crucial for regenerative medicine.

    Purpose of the Study:

    • To assess the positional specificity of developing avian corneal nerves.
    • To investigate the mechanisms guiding nerve growth and branching within the cornea.

    Main Methods:

    • Photographic comparison of developing avian corneas.
    • Digital computer signal averaging for precise analysis.
    • Analysis of nerve fascicle branching patterns and positional homology.

    Main Results:

    • Corneal nerves exhibit significant positional homology within the nerve ring.

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  • Nerve fascicles bifurcate within specific, successive, concentric zones.
  • Branch zone spacing increases with corneal growth, suggesting elongation occurs along the axon.

    • Conclusions:

    • Corneal nerve growth cones follow specific pathways.
    • The intra-corneal environment dictates nerve branching points.
    • Neurite elongation occurs at both growth cones and inter-branch sites.