1202 



.ANCHNOLOGY 



part of the shelf. As the pancreas extends to the left toward the spleen it crosses 

 the upper part of the kidney, and is so moulded on to it that the top of the kidney 

 forms an extension inward and backward of the upper surface of the pancreas 

 and extends the bed in this direction. On the other hand, the extremity of the 

 pancreas comes in contact with the spleen in such a way that the plane of its 

 upper surface runs with little interruption upward and backward into the concave 

 gastric surface of the spleen, which completes the bed behind and to the left, and, 

 running upward, forms a partial cap for the wide end of the stomach. 1 



Hepatic artery 

 Portal vein 

 Common bile-duct 

 Orifice of common 



bile-duct and pan- Accessory pancreatic duct 



creatic duct ... a ,aaamn/mm, , . . , , 



Pancreatic duct 



FIG. 1100. The pancreatic duct. 



The Pancreatic Duct (ductus pancreaticus [Wirsungi]; duct of Wirsung) extends 

 transversely from left to right through the substance of the pancreas (Fig. 1 100) . It 

 commences by the junction of the small ducts of the lobules situated in the tail of the 

 pancreas, and, running from left to right through the body, it receives the ducts of the 

 various lobules composing the gland. Considerably augmented in size, it reaches the 

 neck, and turning downward, backward, and to the right, it comes into relation with 

 the common bile duct, which lies to its right side; leaving the head of the gland, 

 it passes very obliquely through the mucous and muscular coats of the duodenum, 

 and ends by an orifice common to it and the common bile duct upon the summit 

 of the duodenal papilla, situated at the medial side of the descending portion 

 of the duodenum, 7.5 to 10 cm. below the pylorus. The pancreatic duct, near the 

 duodenum, is about the size of an ordinary quill. Sometimes the pancreatic duct 

 and the common bile duct open separately into the duodenum. Frequently there 

 is an additional duct, which is given off from the pancreatic duct in the neck of 

 the pancreas and opens into the duodenum about 2.5 cm. above the duodenal 

 papilla. It receives the ducts from the lower part of the head, and is known as 

 the accessory pancreatic duct (duct of Santorini), 



Development (Figs. 1101, 1102). The pancreas is developed in two parts, a 

 dorsal and a ventral. The former arises as a diverticulum from the dorsal aspect 



1 Journal of Anatomy and Physiology, pt. 1, xxxi, 102. 



