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Structural and functional post-embryonic development of a non-rectifying electrical synapse in the crayfish
B Leitch1, R M Pitman, W J Heitler
1Gatty Marine Laboratory, University of St. Andrews, Fife, Scotland, UK.
Journal of Neurocytology
|February 1, 1992
Summary
The lateral giant (LG) fibre synapse is functional at hatching, despite immature vesicle populations. This study tracks the development of this crucial electrical synapse in crayfish.
Area of Science:
- Neuroscience
- Developmental Biology
- Cell Biology
Background:
- The lateral giant (LG) fibre synapse is a key electrical junction in crayfish.
- Understanding its development is crucial for comprehending neural circuit maturation.
Purpose of the Study:
- To investigate the post-embryonic development of the non-rectifying septate synapse between homologous lateral giant fibre segments.
- To correlate structural changes with functional maturation of the LG-LG synapse.
Main Methods:
- Electron microscopy was used to examine synaptic ultrastructure.
- Electrophysiology, including intracellular recordings, assessed synaptic function.
- Lucifer Yellow was employed to trace intercellular communication.
Main Results:
- Newly hatched crayfish synapses exhibit wide membrane separation and small, pleomorphic vesicles, differing from adult morphology.
- Synaptic vesicles mature into larger, spherical forms, and wide separations decrease during development.
- Despite structural immaturity, the synapse is electrically functional at hatching, allowing passage of Lucifer Yellow.
Conclusions:
- The lateral giant fibre synapse is functionally mature at hatching, despite ongoing structural development.
- Synaptic vesicle composition and membrane apposition undergo significant changes post-embryonic development.
- This study elucidates the developmental trajectory of a critical neural junction in crustaceans.