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Communicating synapses: types and functional interpretation. Exceptions to Cajal's neuron theory.

R González Santander1, G Martínez Cuadrado, M V Toledo Lobo

  • 1Department of Morphological Sciences and Surgery, Faculty of Medicine, University of Alcalá de Henares, Madrid, Spain.

Acta Anatomica
|January 1, 1991
PubMed
Summary

Researchers discovered novel communicating synapses in the dorsal periaqueductal nucleus, challenging Cajal

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Area of Science:

  • Neuroscience
  • Cell Biology
  • Electron Microscopy

Background:

  • Cajal's neuron theory posits the independence of neurons.
  • Synaptic communication is fundamental to neural function.

Purpose of the Study:

  • To investigate the ultrastructure of neuronal synapses in the dorsal periaqueductal nucleus.
  • To identify exceptions to Cajal's neuron theory.

Main Methods:

  • Transmission electron microscopy was employed.
  • Observation of synaptic contacts in the mesencephalon.

Main Results:

  • Identified simple and complex communicating synapses with direct intercellular passages.
  • Classified six types of communicating synapses (I-VI).

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  • These synapses involve direct continuity between neuronal membranes.

    • Conclusions:

    • Communicating synapses may represent an exception to Cajal's neuron theory.
    • These structures could modulate synaptic function, neurotransmitter release, and impulse transmission.
    • Simple types may intensify, while complex types modulate or retard synaptic activity.