c l i n i c a l f o l i o s : n a r r a t i v e





A D V E R T I S E M E N T

 

Biliary Embryology: 1

A D V E R T I S E M E N T

   
 

The mid-portion of the gut tube is open to the yolk sac at 4 weeks and the upper lip of this opening lies below a body wall partition called the septum transversarum. Above the septum lies the heart. The blood supply to the viscera arises as multiple unpaired ventral splanchnic branches of the aorta which travel in the dorsal and ventral mesenteries supporting the gut. A few of these branches become dominant and the rest regress. Vascular variations originate during this period.     

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Biliary Embryology: 2

A D V E R T I S E M E N T

   
 

The gut endoderm grows up into the septum transversarum forming the hepatic diverticulum. Multiple cords at the cephalad end of the bud acquire caps of hepatocytes and form hepatic parenchyma and hepatic ducts. An outpouching from the hepatic stalk will become the gallbladder. The dorsal pancreatic bud begins to appear on the opposite wall of the gut tube.      

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Biliary Embryology: 3

A D V E R T I S E M E N T

   
 

Around the fifth week, a second outpouching from the biliary stalk will become the ventral pancreatic bud. The dorsal pancreatic bud continues to grow from the dorsal wall of the closing gut tube. This area of the gut becomes the duodenum. The growing liver protrudes into the coelomic cavity, partially separating itself from the septum transversarum. The part that remains adherent lies up against the future diaphragm and the plane of contact will be called the bare area of the liver.     

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This page was last modified on 6/30/1999.