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Nervous system of the snailHelix aspersa

III. Electron microscopic study of neurosecretory nerves and endings in the ganglionic sheath
  • Juan Fernández
  • M. Soledad Fernández
Article

Summary

The fine structure of neurosecretory nerves and endings associated with the sheath of the infraesophageal ganglion ofHelix aspersa is described. The sheath is a neurohemal organ whose vascularized stroma receives both monoaminergic and peptidergic endings. The latter occur along the surface of the nerves or scattered within the stroma. They include a complex population of vesicular profiles. The granular vesicles (1300–3000 Å in diameter) exhibit structural modifications that may be related to the intra-axonal release of their neurohormones. The agranular vesicles (500–2000 Å in diameter) occur in large numbers and lie mostly adjacent to the axon surface. Synaptoid specializations seem to represent active sites for the extracellular discharge of neurosecretory material. The monoaminergic endings so far studied lack synaptoid specializations and contain small granular (800–1300 Å in diameter) and agranular (700 Å in diameter) vesicles. Two kinds of non-neural cells are associated with the nerves: glial cells and melanocytes.

Key words

Neurosecretory nerves Glial and pigment cells Neural sheath Gastropods Ultrastructure 

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Copyright information

© Springer-Verlag 1972

Authors and Affiliations

  • Juan Fernández
    • 1
  • M. Soledad Fernández
    • 1
  1. 1.Departamento de Biología, Facultad de CienciasUniversidad de ChileSantiagoChile

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