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Early trabeculation and closure of the interventricular foramen in staged human embryos

M Rauhut-Klaban1, M Bruska, W Woźniak

  • 1Department of Anatomy, Medical University, Poznań, Poland.

Folia Morphologica
|March 13, 2008
PubMed

Insights

This study details human ventricular development from stages 13-19, showing advanced trabeculation and septum formation. Key findings include the development of the membranous interventricular septum and obliteration of the interventricular foramen.

Area of Science:

  • Embryology
  • Developmental Biology
  • Cardiovascular Science

Background:

  • Human ventricular development is crucial for cardiac function.
  • Understanding early septation is key to identifying congenital heart defects.

Purpose of the Study:

  • To describe the internal differentiation of human ventricles during early embryonic development (stages 13-19).
  • To detail the formation and maturation of the interventricular septum and atrioventricular canal division.

Main Methods:

  • Serial sectioning of human embryos at developmental stages 13-19 (postovulatory days 32-46).
  • Microscopic examination of ventricular structure, trabeculation, and septal development.

Main Results:

  • Advanced ventricular trabeculation and a well-marked muscular interventricular septum were observed at stage 13.
  • Fusion of endocardial cushions and division of the atrioventricular canal occurred by stage 13.
  • Development of the membranous interventricular septum and obliteration of the interventricular foramen were noted at stage 18.
  • Increasing cellularity of the membranous interventricular septum was evident at stage 19.

Conclusions:

  • The study provides a detailed timeline of human ventricular septation and differentiation.
  • These findings contribute to the understanding of normal heart development and potential origins of septal defects.

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