THE VENTRAL PANCREAS 395 



fore arise from the trabeculae, and others are detached outgrowths 

 of the cystic duct or gall bladder, with which two of them were 

 seen to be connected. "^ After becoming detached, they may 

 migrate along the peritoneum to the elevation where they are 

 frequently found. 



Although most of the nodules and cysts are of hepatic origin, 

 it is still possible that some of them are derived from the pan- 

 creas. In two specimens, nodules indistinguishable in structure 

 from that shown in fig. 10 were found on the intestinal side of the 

 mesentery. It is quite improbable that these came from the 

 liver. The largest cyst observed, which is shown in fig. 12, 

 occurred in a 20 mm. embryo. It occupies the same position as 

 the nodule in fig. 10. In structure, it closely resembles the mes- 

 enteric cyst found in another pig embryo of 20 mm., which was 

 figured by Lewis and Thyng in vol. 7 of this Journal (p. 509). 

 The mesenteric cyst was probably derived from an accessory 

 pancreas, and it is possible that the cyst shown in fig. 12 is of pan- 

 creatic origin. That the left lobe of the ventral pancreas may 

 extend across the ventral mesentery to the hepatic side, is shown 

 in fig. 11, from an embryo of 6.0 mm. Moreover, a constriction 

 suggests that the terminal part of this lobe may become detached. 

 In an embryo of 8.0 mm., Wlassow found the left lobe extending 

 still further across the mesentery, as seen in fig. 3 of his publica- 

 tion. Although corresponding conditions have apparently not 

 been observed in the adult pig, it is of interest to note that in 

 two cats, Heuer found lobes of the pancreas extending along the 

 cystic and common bile ducts to the gall bladder. 



At the Ithaca meeting of the American Association of Anato- 

 mists, Dresbach demonstrated a very interesting specimen of 

 'pancreatic bladder' in the adult cat. In such cases, which have 

 been reported by Mayer, Gage, and Miller, the ductus choledo- 

 chus is accompanied by another duct, which terminates in an ex- 

 pansion resembling the gall bladder, to which it is closely applied. 

 Moreover its microscopic structure, as found by Dresbach, is 



iln addition to the slender outgrowths referred to, the gall bladder presents 

 rounded outpocketings, which are being studied in this laboratory by Dr. H. 

 Bernstein. 



