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[Embryonic development of the human duodenum]
Insights
Human embryonic development of the duodenum begins with pancreatic epithelial germ formation. This organ anlage develops a three-layered wall and a characteristic arch shape during early embryogenesis.
Area of Science:
- Developmental biology
- Human embryology
- Gastrointestinal development
Context:
- The formation of the duodenal anlage is a critical early event in human embryogenesis.
- It occurs concurrently with the development of pancreatic epithelial structures.
- The initial stages involve the formation of an arch with a distinct middle ductal enlargement.
Purpose:
- To describe the morphological development of the human duodenal anlage.
- To correlate duodenal development with pancreatic germ formation.
- To elucidate the structural changes leading to the characteristic duodenal shape in early human embryos.
Summary:
- The epithelial duodenal anlage initiates at the end of the first month of human embryogenesis, coinciding with pancreatic epithelial germ appearance.
- By 5.5-6 weeks, the anlage forms a three-layered structure, developing into an arch with a spindle-like middle ductal part, connected to the pancreatic head.
- By 8-8.5 weeks, intensive pancreatic growth drives the duodenum's expansion into superior, descending, and inferior parts, forming a semicircular shape, initially a spiral coil due to uneven growth.
Impact:
- Provides a detailed timeline of early duodenal and pancreatic development.
- Enhances understanding of normal gastrointestinal morphogenesis.
- Establishes a foundation for studying congenital duodenal anomalies.
Abstract:
Epithelial duodenal anlage takes place at the end of the first month of the human embryogenesis in connection with appearance of the pancreatic epithelial germs. It has a form of a short arch with a spindle-like enlargement of the middle ductal part. Formation of the hepato-duodenal ligament and of the duodenal mesentery results in appearance of the given organ anlage with a three-layered wall in 5.5-6-week-old embryos. The anlage makes an arch, protruding to the right and forward with a spindle-like enlargement of the middle ductal part. It is tightly connected with the forming anlage of the pancreatic head, when the pancreatic epithelial anlages are fusing. An intensive growth of the pancreatic head is accompanied with emergence and enlargement of the superior, descending and inferior parts of the duodenum, that acquires a semicircular form in 8-8.5-week-old embryos. Its transitional stage is a curved semicircle having a form of a distended spiral coil; that reflects an uneven growth of the organ in the human embryogenesis.