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Structure of developing frog neuromuscular junctions.

M S Letinsky, K Morrison-Graham

    Journal of Neurocytology
    |June 1, 1980
    PubMed
    Summary
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    This study observed neuromuscular junction development in frogs, detailing how nerve contacts mature and become complex. It highlights transient multiple innervation and gradual acetylcholinesterase activity during synapse formation.

    Area of Science:

    • Neuroscience
    • Developmental Biology

    Background:

    • Neuromuscular junctions (NMJs) are critical for muscle control.
    • Understanding NMJ development provides insights into neural plasticity and regeneration.

    Purpose of the Study:

    • To investigate the morphological and functional development of NMJs in the frog cutaneous pectoris muscle.
    • To characterize the sequence of events during synapse formation, including nerve terminal growth and acetylcholinesterase (AChE) activity.

    Main Methods:

    • Light microscopy was used to examine NMJs in tadpole and postmetamorphic frog muscles.
    • The NBT-acetylcholinesterase (AChE) method was employed to visualize presynaptic nerve terminals and postsynaptic AChE activity simultaneously.

    Main Results:

    Related Experiment Videos

  • Early nerve contacts were small enlargements on unmyelinated axons, progressing to complex, branched terminal arborizations.
  • Initially single axon innervation evolved to multiple innervation, a transient phase subsequently eliminated during maturation.
  • Acetylcholinesterase (AChE) activity appeared gradually, sometimes unevenly distributed across developing nerve terminals.

    • Conclusions:

    • Frog NMJ development involves intricate processes of axonal growth, branching, and dynamic innervation patterns.
    • Synapse elimination, including the resolution of multiple innervation, is a protracted process during amphibian metamorphosis.
    • The temporal and spatial emergence of acetylcholinesterase (AChE) activity is closely linked to NMJ maturation.