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The subcommissural organ

E M Rodríguez1, S Rodríguez, S Hein

  • 1Instituto de Histología y Patología, Facultad de Medicina, Universidad Austral de Chile, Valdivia.

Microscopy Research and Technique
|May 14, 1998
PubMed
Summary
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The subcommissural organ (SCO) secretes Reissner's fiber (RF), a protein structure extending through the brain's ventricles and spinal cord. Its precise function remains unknown but may involve cerebrospinal fluid (CSF) regulation.

Area of Science:

  • Neuroscience
  • Developmental Biology
  • Cell Biology

Background:

  • The subcommissural organ (SCO) is an ancient, early-developing brain structure.
  • It comprises specialized ependymal and hypendymal cells.
  • The SCO is located at the Sylvian aqueduct entrance.

Purpose of the Study:

  • To detail the structure and secretion of the subcommissural organ (SCO).
  • To describe the formation and pathway of Reissner's fiber (RF).
  • To explore potential functions of the SCO and its secretions.

Main Methods:

  • Histological and biochemical analysis of SCO secretions.
  • Tracing the path of Reissner's fiber (RF) through the central nervous system.
  • Investigating the SCO's relationship with cerebrospinal fluid (CSF) and blood supply.

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Main Results:

  • SCO ependymal cells secrete high molecular mass glycoproteins that form Reissner's fiber (RF).
  • RF extends from the brain ventricles to the spinal cord's terminal ventricle.
  • The SCO also releases CSF-soluble material distinct from RF, and is protected by blood-brain and CSF-SCO barriers.

Conclusions:

  • The subcommissural organ (SCO) produces Reissner's fiber (RF) and other CSF-soluble factors.
  • RF undergoes modification and elimination in the terminal ventricle.
  • The SCO's exact function is undetermined, but it may influence CSF dynamics and development.