~~ 
498 Pancreas in Embryos of the Pig, Rabbit, Cat, and Man 
of the 10-mm. embryo (Figs. XI and XII, Pl. I) agrees essentially with 
those of Hamburger. The dorsal pancreas at this stage was separate 
from the ventral, but in the 18-mm. embryo anastomosis between the two 
had occurred ventral to the portal vein. 
Helly, o1, figures the pancreas of a 11-mm. human embryo (Fig. 30, 
Taf. XVII). He represents the dorsal pancreas as arising from the 
intestine nearer the pylorus than the opening of the bile duct. He also 
represents a right and a left ventral pancreas arising from the common 
bile duct. The right ventral pancreas is the larger; the left shows evi- 
dence of degeneration. In a later publication, 04, he cites two cases 
D. cyst. 
Panc.d 
Fic. 5. Reconstruction from a human embryo of 7.5 mm. (H. E. C. 256). 
x 55 diams. D. chol., ductus choledochus. D. cyst., ductus cysticus. D. hep.. 
ductus hepaticus. Panc. d., pancreas dorsale. Panc. v., pancreas ventrale. 
St., stomach. Ves. fel., vesica fellea. 
(human embryos of 6.5 and 9.5 mm.) where the dorsal pancreas has a 
pronounced cranial position. Helly believes that in man the final posi- 
tion of the opening of both pancreatic ducts is established at the very 
beginning of their development. 
Volker, o2, describes two human embryos, one of 3 mm., the other of 
13 mm. In the younger embryo the dorsal pancreas is an outpocketing 
from the dorsal wall of the duodenum. The greater part of it is posterior 
to the liver. In the older embryo (13 mm.) the duct of the dorsal pan- 
creas opens into the dorsal side of the intestine at about the same level 
as the common bile duct. In this paper and in a later publication, 03, 
