400 



THE DIGESTIVE SYSTEM 



FIG. 373. SECTION OF AN ACINUS FROM THE GUINEA-PIG'S PANCREAS, SHOWING THE 

 BASAL MITOCHONDRIAL CONTENT AND THE CENTRAL ZYMOGEN GRANULES. 



Bensley's mitochondrial technic. X 1200 (After Bensley, Am. Jour. Anat., 12, 3, 

 1911.) 



cell groups). The islet cells are arranged in irregular cords, frequently 

 only two cells deep, lying in the meshes of capilliform sinusoids, from 

 which they appear to be separated by little more than the eudothelial 



FIG. 374. INTERCALARY DUCT WITH BRANCHES, FROM PANCREAS OF GUINEA-PIG, 

 SHOWING HIGHLY BRANCHED TUBULES CONNECTED WITH THE DUCT AND WITH 

 AN ISLET. 



Intravitam staining with pyronin and neutral red. X 50. (Bensley, Amer. 

 Jour. Anat., 12, 3, 1911.) 



wall. The cells are divisible into two distinct, apparently independent 

 types, on the basis of their granular content (Lane, Amer. Jour. Anat., 

 7, 3, 1907). The 'A' and 'W granules differ morphologically and micro- 



