292 



THE ORGANS 



in small ganglia within the substance of the gland. They pass to 

 plexuses among the secreting tubules, to which and to the walls 

 of the vessels they send delicate terminal fibrils. 



TECHNIC 



(i) The general tcchnic for the pancreas is the same as for the salivary 

 glands (page 286). 



(2) Zymogen granules may be demonstrated by fixation in formalin-Miil- 

 ler's fluid (technic 6, p. 7), and staining with picro-acid-fuchsin (technic 2, p. 

 21), or with Heidenhain's iron haematoxylin (technic 3, p. 18). 



(3) The arrangement of the blood-vessels in the islands of Langerhans may 

 be studied in specimens in which the vascular system has been injected (page 25). 



The Liver 



The liver is a compound tubular gland, the secreting tubules of 

 which anastomose. There are thus, strictly speaking, no "terminal 



Fig. 194. — Section of Lobule of Pig's Liver X60 (technic i, p. 301), showing lobule 

 completely surrounded by connective tissue, a, Portal vein; b, bile duct; c, hepatic 

 artery; d, portal canal; e, capillaries;/, central vein; g, cords of liver cells; //, hepatic vein. 



tubules" in the liver, the lumina and walls of neighboring tubules 

 anastomosing without any distinct line of demarcation. 



