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Related Experiment Videos

Small, intensely fluorescent cells and the paraneuron concept.

M R Matthews1

  • 1Department of Human Anatomy, University of Oxford, England.

Journal of Electron Microscopy Technique
|August 1, 1989
PubMed
Summary

Small, intensely fluorescent (SIF) cells in sympathetic ganglia are unique nerve cells. Their precise roles in autonomic nervous system function remain under investigation, despite extensive study.

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Area of Science:

  • Neuroscience
  • Autonomic Nervous System
  • Cell Biology

Background:

  • Sympathetic ganglia house principal neurons and smaller cells resembling adrenal medulla endocrine cells.
  • These smaller cells, termed small, intensely fluorescent (SIF) cells, exhibit chromaffinity.
  • SIF cells are characterized by dense-cored granules observed via electron microscopy.

Purpose of the Study:

  • To detail the morphology and synaptic relationships of SIF cells within sympathetic ganglia.
  • To explore the proposed roles of SIF cells as interneurons or endocrine-like components.
  • To investigate the structural diversity of SIF cells, including singly occurring and clustered forms.

Main Methods:

  • Formaldehyde-induced fluorescence technique for identifying and naming SIF cells.
  • Electron microscopy for detailed structural analysis and intercellular relationships.
  • Histological examination of SIF cell distribution and morphology in rat superior cervical ganglion.

Main Results:

  • SIF cells were identified by their intense fluorescence and dense-cored granules.
  • SIF cells in the rat superior cervical ganglion receive and transmit synaptic signals.
  • SIF cells exist as single units (Type I) and in vascularized clusters (Type II).

Conclusions:

  • SIF cells possess characteristics suggesting roles as both interneurons and endocrine-like elements.
  • The exact functional significance of SIF cells within the autonomic nervous system requires further elucidation.
  • Structural and positional variations of SIF cells (Type I vs. Type II) hint at diverse functional capacities.

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