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Related Experiment Videos

The fine structure of a rectifying electrotonic synapse

R B Hanna, J S Keeter, G D Pappas

    The Journal of Cell Biology
    |December 1, 1978
    PubMed
    Summary
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    Crayfish giant axon synapses are electronic junctions that allow nerve impulse transmission. These rectifying junctions, similar to gap junctions, show asymmetry with vesicles in the presynaptic neuron.

    Area of Science:

    • Neuroscience
    • Cell Biology
    • Crustacean Physiology

    Background:

    • The abdominal ganglia of crayfish (Procambarus clarkii) contain giant axons crucial for rapid motor responses.
    • Electronic synapses, or gap junctions, facilitate direct electrical coupling between neurons.

    Purpose of the Study:

    • To characterize the ultrastructure and function of the synapse between the lateral giant axon and the giant motor axon in crayfish.
    • To investigate the rectifying properties and morphological asymmetry of this electronic synapse.

    Main Methods:

    • Transmission electron microscopy was used to examine the ultrastructure of the synapse.
    • Functional properties were inferred from the observed rectifying nature of the junctional membrane.

    Main Results:

    Related Experiment Videos

    • The synapse is an electronic junction with closely apposed membranes, resembling typical arthropod gap junctions.
    • The junctional membrane exhibits rectification, preferentially transmitting impulses from the lateral giant fiber to the giant motor fiber.
    • Morphological asymmetry was noted, with vesicles present in the presynaptic terminal and increased mitochondria/endoplasmic reticulum in the postsynaptic neuron.

    Conclusions:

    • The lateral giant axon to giant motor axon synapse in crayfish is a rectifying electronic junction.
    • This rectifying property likely enhances the efficiency and directionality of escape responses mediated by the giant fiber system.
    • Ultrastructural asymmetry correlates with the functional specialization of this synapse.