490 Pancreas in Embryos of the Pig, Rabbit, Cat, and Man 
Pic EmBryos. 
Wlassow, 95, was the first to describe the development of the pancreas 
in the pig. He figures a model and transverse sections of the pancreas in 
an 8.7-mm. pig, and also describes with the aid of transverse sections a 
still younger embryo (8 mm.). 
Volker, 02, describes the development of the pancreas of the pig, from 
a series of models in the embryological collection of the University in 
Prague. He pictures three of these in Figs. 19, 20, and 21, but unfor- 
tunately does not give either the age or length of the embryos from 
which the models were made. 
Lewis, 03, reconstructed a 12-mm. pig embryo, and in Plate IIT shows 
incidentally the gross relations of the pancreas. 
Fic. 1. Reconstruction from a pig embryo of 5.5 mm. (H. E. C. 915). 
x 55 diams. a, b, c, d, cords of hepatic cells. Panc. d., pancreas dorsale. 
Pane. v., pancreas ventrale. St., stomach. Ves. fel., vesica fellea. a, ventral 
process of the dorsal pancreas, on the right of the portal vein. 
The first model which J shall describe is from a pig embryo 5.5 mm. 
in length (Harvard Embryological Collection, Series 915). In Fig. 1 it 
is drawn from the right side, as are the models of Wlassow and Volker. 
A little beyond the stomach (St.) the hepatic diverticulum opens into 
the ventral side of the duodenum. Distally it presents a considerable 
enlargement from which project several cords of hepatic cells (a, 6, ¢, 
d, etc.), one of which will ultimately form the hepatic duct. The gall 
bladder (Ves. fel.) at this stage is represented by a distinct pouch from 
the distal, posterior or caudal wall of the diverticulum. Another out- 
growth from the posterior wall of the diverticulum is found near its 
intestinal orifice; this is the ventral pancreas (Pane. v.). It is a flat- 
tened triangular structure attached to the hepatic diverticulum by a stalk 
