Which developmental event leads to the fusion of the dorsal and ventral pancreatic buds?

Which developmental event leads to the fusion of the dorsal and ventral pancreatic buds?

• A. Rotation of the stomach to the left
• B. Rotation of the duodenum to the right
• C. Rotation of the liver
• D. No rotation

Answer: (B)

During foregut development, fusion of the dorsal and ventral pancreatic buds is driven by the rightward rotation of the duodenum. As the duodenum rotates, the ventral pancreatic bud moves around the future duodenum to end up posterior to the dorsal bud, allowing the two buds to fuse and form the pancreas with a connected duct system. This rotation brings the ventral bud into the proper position relative to the dorsally located bud, which is why rightward rotation is the key event. Other movements don’t achieve this fusion: rotating the stomach alters stomach orientation but not the pancreatic buds' positions; the liver’s movement isn’t the initiating factor for bud fusion; and no rotation wouldn’t bring the buds together.

During foregut development, fusion of the dorsal and ventral pancreatic buds is driven by the rightward rotation of the duodenum. As the duodenum rotates, the ventral pancreatic bud moves around the future duodenum to end up posterior to the dorsal bud, allowing the two buds to fuse and form the pancreas with a connected duct system. This rotation brings the ventral bud into the proper position relative to the dorsally located bud, which is why rightward rotation is the key event.

Other movements don’t achieve this fusion: rotating the stomach alters stomach orientation but not the pancreatic buds' positions; the liver’s movement isn’t the initiating factor for bud fusion; and no rotation wouldn’t bring the buds together.