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Fate of the atrioventricular endocardial cushions in the developing chick heart

C Chin1, R Gandour-Edwards, S Oltjen

  • 1Division of Pediatric Cardiology, University of California, Davis Medical Center, Sacramento 95817.

Pediatric Research
|October 1, 1992
PubMed

Insights

The mitral valve leaflets in chick embryos primarily develop from endocardial cushion tissue. The tricuspid band, however, shows contributions from both endocardial cushions and surrounding myocardium during cardiac development.

Area of Science:

  • Developmental Biology
  • Cardiovascular Science
  • Histology

Background:

  • The atrioventricular endocardial cushions are critical structures in cardiac development.
  • Understanding their fate is essential for comprehending heart valve formation.

Purpose of the Study:

  • To investigate the developmental origin of mitral valve leaflets and the tricuspid band.
  • To determine the contribution of endocardial cushions and myocardium to these cardiac structures.

Main Methods:

  • Utilized staining techniques for extracellular fibronectin and actin in chick embryo hearts (Hamburger and Hamilton stages 26-36).
  • Examined serial sections of the atrioventricular valve region to visualize tissue composition.

Main Results:

  • Mitral valve leaflets showed a fibronectin-rich matrix but lacked myocytes.
  • The tricuspid band contained both fibronectin matrix and myocytes.
  • A clear separation was observed between endocardial cushions and myocardial layers before valve formation.

Conclusions:

  • Chick mitral valve leaflets predominantly originate from endocardial cushion tissue.
  • The tricuspid band develops from both endocardial cushions and surrounding myocardium.

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