By which week does the midgut reenter the abdomen?

By which week does the midgut reenter the abdomen?

• A. 8th week
• B. 16th week
• C. At birth
• D. 12th week

Answer: (D)

This question tests the timing of midgut reentry into the abdomen during embryonic development. The midgut temporarily herniates into the umbilical cord because the rapidly growing intestines outpace the space inside the abdominal cavity. While herniated, it undergoes a 270-degree counterclockwise rotation around the superior mesenteric artery. It then returns to the abdomen and completes its final positioning by about the 12th week of development (often cited as 10–12 weeks). Therefore, the most accurate timing is the 12th week.

This question tests the timing of midgut reentry into the abdomen during embryonic development. The midgut temporarily herniates into the umbilical cord because the rapidly growing intestines outpace the space inside the abdominal cavity. While herniated, it undergoes a 270-degree counterclockwise rotation around the superior mesenteric artery. It then returns to the abdomen and completes its final positioning by about the 12th week of development (often cited as 10–12 weeks). Therefore, the most accurate timing is the 12th week.