Pancreas
 


Gut development video -Interactive video text

Two diverticula form the pancreas- a dorsal diverticulum which forms the main pancreas and a ventral diverticulum together with the diverticulum of the liver forms the hepatopancreatic diverticulum.

The duodenum also forms a loop whose concavity faces posteriorly. After rotation the concavity now faces the left. This is the duodenal loop. Before the rotation, the mid point of the loop which is the junction between the foregut and midgut develops two diverticula, a dorsal diverticulum at the concavity of the loop which faces dorsally that is the dorsal pancreas and then a ventral diverticulum which is the hepatopancreatic diverticulum. Both will fuse to form the pancreas.

The two diverticula are connected to the developing duodenum through the ductal system. The ventral diverticulum has a common duct with the developing liver. Immediately rotation of the foregut occurs the ventral pancreas is moved into the concavity of the duodenum which fuses with the dorsal pancreas. The ventral pancreas now forms the lower part of the head of the pancreas trappig he superiro vmesentric vessels betweenthem

The duct of the dorsal pancreas initially still drain into the duodenum directly. Later the duct of the ventral pancreas forms the duct of the dorsal pancreas so that the two form the main pancreatic duct. The remaining part of the duct of the dorsal pancreas becomes the accessory pancreatic duct.

The main pancreatic duct now opens at the hepatopancreatic ampulla of Vater into the duodenum. The ampulla is provided with a sphincter of Oddi which controls the flow of the pancreas and the flow of the common bile duct into the duodenum so that one does not regurgitate into the other. The adult pancreas has two ducts, a main pancreatic duct and an accessory pancreatic duct of Santorini.

 

 

  

 

   

 

 

 

 

 

 

  

Oluwole Ogunranti 

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