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Related Experiment Videos

Synaptic development in the crayfish opener muscle

H L Atwood, I Kwan

    Journal of Neurobiology
    |July 1, 1976
    PubMed
    Summary
    This summary is machine-generated.

    This study reveals that crayfish neuromuscular synapses mature differentially. Inhibitory synapses develop faster than excitatory ones, with axo-axonal synapses maturing last.

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    Area of Science:

    • Neurobiology
    • Developmental Biology
    • Crustacean Physiology

    Background:

    • Crayfish walking leg opener muscles develop from syncytia to distinct muscle fibers.
    • Innervation of these muscles begins shortly after hatching and progresses with age.
    • Mature muscles feature excitatory/inhibitory neuromuscular and inhibitory axo-axonal synapses.

    Purpose of the Study:

    • To investigate the developmental timeline and maturation process of different synapse types in crayfish opener muscles.
    • To characterize the morphological changes and timing of synapse formation during muscle development.

    Main Methods:

    • Electron microscopy was used to examine nerve terminal regions in crayfish opener muscles.
    • Samples were collected from crayfish aged 0 to 245 days post-hatching.

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  • Morphological analysis focused on synapse structure, size, and presence of dense bodies.

    • Main Results:

    • Innervation appears within days of hatching and expands as the muscle grows and subdivides.
    • Excitatory and inhibitory neuromuscular synapses enlarge progressively, reaching final size within two months.
    • Inhibitory neuromuscular synapses mature faster than excitatory ones; axo-axonal synapses mature last.

    Conclusions:

    • Synapse development in crayfish opener muscles is a protracted process with distinct maturation rates for different synapse types.
    • Morphological maturation, including the appearance of dense bodies, occurs differentially among synapse classes.
    • This study provides insights into the neurodevelopmental plasticity of crustacean neuromuscular systems.