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End-results of experimental gastroschisis created by abdominal wall versus umbilical cord defect
1Department of Pediatric Surgery, Dokuz Eylül University, Medical Faculty, Izmir, Turkey.
Insights
This study on chick embryos found that defects in the umbilical cord, not the abdominal wall, cause bowel damage resembling gastroschisis (GS). The umbilical cord defect is the likely cause of this congenital condition.
Area of Science:
- Developmental biology
- Embryology
- Congenital anomalies
Background:
- Gastroschisis (GS) is a congenital defect involving abdominal wall closure.
- The exact origin of GS, whether the abdominal wall or umbilical cord, remains debated.
Purpose of the Study:
- To compare the outcomes of two distinct embryonic defects: abdominal wall defect (AWD) and umbilical cord defect (UCD).
- To investigate the embryonic origin of bowel damage characteristic of gastroschisis.
Main Methods:
- Experimental creation of AWD and UCD in chick embryos.
- Incubation and subsequent examination of embryonic development.
- Macroscopic and microscopic analysis of intestinal and abdominal wall structures.
Main Results:
- Intestinal hemorrhage and bowel wall/mucosal villi damage were observed in the AWD group.
- The UCD group did not exhibit similar hemorrhagic or damage findings.
- Defects mimicking physiological umbilical hernia led to bowel damage resembling gastroschisis.
Conclusions:
- The physiological umbilical hernia, not the abdominal wall itself, is implicated as the site of defect in gastroschisis.
- Findings suggest the umbilical cord plays a critical role in the pathogenesis of gastroschisis.
Abstract:
An experimental study was conducted to determine the end-results of two different defects on the anterior abdominal wall: an abdominal wall defect (AWD) versus an umbilical cord defect (UCD) using chick embryos. The AWD was created by leaving an intact skin bridge between the defect and the umbilical cord in group 1; the UCD was created on the umbilical cord near the junction of the skin in group 2. At the end of incubation, the intestines appeared hemorrhagic in the AWD group, but not in the UCD group. During microscopic examination, hemorrhagic areas were observed in the bowel wall and mucosal villi in the AWD group but not in the UCD group. The end-result of the defect causing the physiological umbilical hernia resulted in bowel damage resembling the classic picture of gastroschisis (GS). We conclude that the site of the defect in GS is not the abdominal wall itself, but the physiological umbilical hernia.