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Related Experiment Videos

Embryonic and postembryonic morphogenesis of a grasshopper interneuron

D Bentley, A Toroian-Raymond

    The Journal of Comparative Neurology
    |October 1, 1981
    PubMed
    Summary

    The development of the DCMD (descending contralateral motion detector) interneuron in grasshoppers shows directed growth during embryogenesis, achieving its mature form before birth. Postembryonic development involves significant, but proportional, growth.

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    Area of Science:

    • Neuroscience
    • Developmental Biology
    • Entomology

    Background:

    • The descending contralateral motion detector (DCMD) interneuron is crucial for grasshopper behavior.
    • Understanding its development is key to comprehending neural circuit formation.

    Purpose of the Study:

    • To detail the embryonic and postembryonic morphogenesis of the grasshopper DCMD interneuron.
    • To identify the timing and mechanisms of its mature form acquisition.

    Main Methods:

    • Silver-intensified cobalt fills were used to examine DCMD morphology across developmental stages.
    • Morphological analysis was conducted on embryonic and postembryonic grasshopper brains.

    Main Results:

    • DCMD arises mid-embryogenesis and exhibits directed growth, with branches forming in their adult locations.

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  • The brain arborization achieves its mature form by the end of embryogenesis, with postembryonic growth being primarily allometric.
  • Embryonic development is characterized by differentiation and logarithmic neurite/soma growth, while postembryonic development involves linear growth and arborization proportional to brain size.

    • Conclusions:

    • The adult DCMD morphology results from initially directed growth, not selection from a diffuse arborization.
    • Embryonic and postembryonic development phases have distinct growth patterns and cellular specializations.