How many degrees does the stomach rotate during development, and in which direction?

How many degrees does the stomach rotate during development, and in which direction?

• A. 45 degrees clockwise
• B. 180 degrees clockwise
• C. 270 degrees clockwise
• D. 90 degrees clockwise

Answer: (D)

The main idea is that the stomach rotates as the foregut develops, reorienting its surfaces. The first and primary rotation is 90 degrees clockwise when viewed from above. This repositions the stomach so that the left side becomes the anterior (ventral) surface and the greater curvature moves toward the left. A second rotation, about 180 degrees, occurs later as the stomach enlarges and settles into the abdomen, bringing the total rotation toward roughly 270 degrees clockwise, but the initial 90-degree rotation is the key point tested here.

The main idea is that the stomach rotates as the foregut develops, reorienting its surfaces. The first and primary rotation is 90 degrees clockwise when viewed from above. This repositions the stomach so that the left side becomes the anterior (ventral) surface and the greater curvature moves toward the left. A second rotation, about 180 degrees, occurs later as the stomach enlarges and settles into the abdomen, bringing the total rotation toward roughly 270 degrees clockwise, but the initial 90-degree rotation is the key point tested here.