TITE DTOF.STIVE SYSTEM 



281 



alcohols. Sections should be ihiii and mounted, either unstained or after a 

 slight eosin stain, in glycerin. 



(4) The blood-vessels of the stomach are best studied in injected specimens. 

 (See page 25.) 



The Larger Glands of the Digestive System 



The smaller tubular glands which form a i)art of the mucous mem- 

 brane and submucosa of the alimentary tract have been already de- 

 scribed. Certain larger glandular structures, the development of 

 which is similar to that of the smaller tubules but which come to lie 

 wholly without the alimentary tract, connected with it only by their 

 main excretory ducts, and which are yet functionally an important 

 part of the digestive system, remain to be considered. 



These are: 



' (a) The parotid. 



1. The salivary glands I (b) The sublingual. 



. (c) The submaxillary. 



2. The pancreas. 



3. The liver. 



The Salivary Glands 



The salivary glands are all compound tubular glands. In man 

 the parotid is serous; the sublingual and submaxillary, mixed serous 



i^a 



ABC 



Fig. 182. — Diagrams to illustrate the Structure of the Salivary Glands. 

 A, Parotid; B, sublingual; C, submaxillary, a, Excretory duct; b, secreting 

 c, intermediate tubule; d, terminal tubule. 



(Stohr.) 

 tubule; 



