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Journal of Neurocytology

, Volume 2, Issue 3, pp 249–263 | Cite as

The nervous system of ctenophores III. Ultrastructure of synapses

  • Mari-Luz Hernandez-Nicaise
Article

Summary

The ultrastructure of synapses from the nervous systems of seven species of ctenophores has been studied. All synaptic contacts so far observed show a peculiar organization characteristic of this phylum: the pre-synaptic neurite contains in sequence from the plasma membrane: a row of vesicles lining the synaptic membrane, a sac of endoplasmic reticulum which is connected with the rough reticulum of the neuron, and one or several mitochondria. The arrangement of these closely associated organelles is constant, forming a complex referred to as thepre-synaptic triad.

The pre-synaptic triad is found both in interneural synapses—which may be polarized, symmetrical or reciprocal — and in various neuro-receptor and neuro-effector junctions.

The possible functional implications of these features are discussed.

Keywords

Nervous System Plasma Membrane Endoplasmic Reticulum Triad Organization Characteristic 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Chapman and Hall Ltd. 1973

Authors and Affiliations

  • Mari-Luz Hernandez-Nicaise
    • 1
  1. 1.Service d'Histologie et Biologie TissulaireUniversité Claude BernardVilleurbanneFrance

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