Daniel G. Kevell 



449 



Ducts (Figs. 8, 9, 10).— The ducts are conveniently described in three 

 parts: (a) intraglandular, (b) free, between the gland and the bowel wall, 

 and (e) duocLenal, in the wall of the duodenum. 



Ductus pancreaticus Figs. 8, 9, 10.— (a) Intraglandular part. The 

 ducts arise in the lobules as the intercalated ducts into which the alveoli 

 open. The interlobular ducts unite usually like a broad Y; one arm 

 of the Y is usually short. The stems of the Y's in turn form arms of 

 larger similar Y's. The planes of successive Y's tend to be at right 

 angles. Occasionlly instead of a Y-form the ducts unite T-like and the 

 arms of the T's may even be bent down a little. Each lobar duct 

 originates by the union 

 of the interlobular, and 

 runs near the axis of 

 the lobe toward the 

 axis of the gland, be- 

 ing joined usually on 

 all sides by various- 

 sized lobular branches 

 by which its caliber is 

 continually augmented. 

 In short broad lobes 

 which do not extend 

 far from the axial duct, 

 the interlobular ducts 

 unite Y-like nearly to 

 the hilus of the lobe. 

 Fig. 10. (The branch- 

 ing is dichotomous.) 



In or near the axis of each limb of the pancreas runs the main or 

 axial duct. It arises in the free extremity of the limb by the union of 

 the lobar ducts there. In its course towards the duodenum it receives 

 lobar ducts on all sides, at wide angles of junction. The axial duct from 

 the caput pancreatis meets and joins that from the cauda, near the duo- 

 denum, adjacent to the lower pancreatic orifice. Thence the main duct 

 passes to the duodenum as: 



(ii) Free part of ductus Santorini. This is most readily found on 

 the left side of the duodenum. It is near the posterior part of that 

 portion of the pancreas which is directly applied to the duodenum. The 

 edge of the pancreas overlaps it and lobules of fat usually conceal its 

 continuation into the bowel wall. IN'ear it there is generally a large 

 blood-vessel on the surface of the bowel. The duct can be located with- 



FiG. 7. — Sections of the duodenum and pancreas, to 

 show the oriflcial papillae. 



