Alimentary And Digestive System Practice Test

Midgut elongates into what shape during development?

Straight tube U-shaped loop ventrally Spiral coil C-shaped loop dorsally

Correct Answer:

C-shaped loop dorsally

Explanation:

During midgut development, the intestine grows very quickly and outpaces the space in the abdominal cavity, so it temporarily herniates into the umbilical cord. Around the axis of the superior mesenteric artery, the elongating midgut forms a loop that curves in a way described as C-shaped and oriented toward the back (dorsally). This dorsal, curved loop is the characteristic shape seen during this stage, before the loop returns to the abdomen and undergoes further rotation. The straight-tube or ventrally positioned configurations don’t reflect this looping around the SMA, and a spiral coil isn’t the typical initial arrangement of the midgut during physiologic herniation.

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