The pancreas develops from two separate endodermal duodenal diverticula, the dorsal and ventral pancreatic bud. When the duodenum rotates, the ventral bud fuses with the dorsal bud. The ventral bud forms the main pancreatic duct, uncinate process and part of the head of the pancreas, while the remaining part of the gland develops from the dorsal bud.

1. Liver bud
2. Stomach
3. Gallbladder
4. Ventral pancreatic bud
5. Dorsal pancreatic bud

1. Liver bud
2. Dorsal pancreas
3. Gallbladder
4. Ventral pancreas
5. Cystic duct
6. Hepatic duct
7. Bile duct

1. Stomach
2. Gallbladder
3. Cystic duct
4. Hepatic duct
5. Bile duct
6. Pancreas
7. Accessory pancreatic duct
8. Main pancreatic duct
9. Ventral pancreatic duct