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Related Experiment Videos

Neuronal pathfinding in developing wings of the moth Manduca sexta.

J B Nardi

    Developmental Biology
    |January 1, 1983
    PubMed
    Summary

    Moth wing sensory axons are guided by directional cues in the basal lamina. Grafting experiments reveal that axons avoid proximally transposed tissues, indicating asymmetric molecular guidance for neural pattern formation.

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    Area of Science:

    • Developmental Biology
    • Neuroscience
    • Insect Morphology

    Background:

    • Moth wing neural patterns form a 2D network between epithelial layers.
    • All neural elements in the wing are sensory, with axons projecting to the mesothoracic ganglion.
    • Wing sensory nerves associate with the basal lamina, suggesting its role in neural patterning.

    Purpose of the Study:

    • To investigate the role of the basal lamina in guiding sensory axon growth within the moth wing.
    • To determine if cues within the basal lamina provide directional information for neural patterning.
    • To understand the molecular mechanisms underlying sensory axon guidance.

    Main Methods:

    • Epithelial grafting experiments were performed on moth wings to alter the basal lamina landscape.
    • The growth patterns of sensory axons were observed in response to control and transposed epithelial grafts.
    • Analysis of axon behavior (crossing or avoiding grafts) was used to infer the presence and nature of directional cues.

    Main Results:

    • Sensory axons generally crossed control and distally displaced grafts.
    • A significant avoidance of proximally transposed grafts by growing axons was observed.
    • This asymmetric response indicates directional cues are present and oriented along the wing axis.

    Conclusions:

    • The basal lamina of the moth wing's upper epithelium contains asymmetric, directional cues for sensory axon guidance.
    • Extracellular matrix molecules in the basal lamina likely provide short-range guidance signals.
    • This study elucidates a mechanism for neural pattern formation in a simple biological system.

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