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[The first stages of the appendix development in the human embryo]
Bulletin De L'Association Des Anatomistes
|December 1, 1978
Summary
The human appendix develops concurrently with the cecum, not as a remnant. Its formation involves distinct mesoblastic and entoblastic anlagen, similar to other lymphoid organs.
Area of Science:
- Embryology
- Developmental Biology
- Human Anatomy
Context:
- The cecoappendicular region of human embryos was examined.
- Study included embryos aged 28–48 days (Carnegie stages 13–19).
Purpose:
- To investigate the developmental origin of the human appendix.
- To determine if the appendix is an atrophic remnant or a distinct structure.
Summary:
- The appendix originates simultaneously with the cecum, not as a vestigial structure.
- Early stages (6–10 mm) show a mesenchyme-derived elevation (mesoblastic anlage).
- Later stages (11–17 mm) reveal invasion by entoblastic cells, completing appendix formation.
Impact:
- Challenges the notion of the appendix as a non-functional remnant.
- Provides insights into the comparative embryology of lymphoid organs.
- Clarifies the dual-anlage developmental pathway of the appendix.