PANCREAS OF THE PIG 



217 



If the lobule-group is sectioned, it is seen to be itself divided 

 off into smaller divisions by fine septa of areolar tissue. As Harris 

 and Gow found, the division is far from constant. It varies 

 greatly in different parts of the same gland, and even what seems 

 to be a large undivided area is found on tracing down the serial 

 sections to become divided into lobules. The strands of the 

 connective tissue are sufficiently marked in most parts of the 

 pancreas to permit reconstructions from the sections. Such re- 

 constructions show the lobule-groups to be composed of twenty 



Fig. 4 One lobule-group of adult pancreas, duct-injection. Reconstructed 

 from serial sections. X 25. 



to thirty rounded or wedge-shaped masses from 0.5 to 1.0 mm. 

 in diameter (fig. 4). These lobules are usually united to each 

 other, so that adjoining lobules often run together at their bases, 

 and most of them cannot be clearly distinguished in the pig's 

 pancreas without tracing them through the series. For intelli- 

 gent study of the duct and blood-vascular systems it is necessary 

 to make thick slices of injected specimens, and in these prepara- 

 tions it is only by chance that one finds a lobule standing out 



