314 



SALIVAKY GLANDS AND PANCKEAS 



course, the smallest venules passing out of the lobule into the 

 connective tissue septa in which they retrace the course of the 



arteries. 



Lymphatics are relatively few and are 

 for the most part confined to the inter- 

 lobular septa, where they form cleft-like 

 spaces which lead to true lymphatic ves- 

 sels and so on to the lymphatic glands of 

 the cervical region. 



Nerve Supply, The salivary glands 

 are abundantly supplied with nerves, 

 which are derived from both sympathetic 

 and cerebro-spinal trunks. They are dis- 

 tributed to the walls of the blood vessels 

 and ducts, and to the secreting cells of 

 the acini. The nerve trunks are found 

 in the interlobular connective tissue 

 where they are supplied with small gan- 

 glia which 

 are most 

 abundant in 

 the submax- 



illary and least numerous in the paro- 

 tid gland. 



Delicate fibre bundles from the 

 interlobular nerve trunks enter the 

 lobules and form a plexus of naked 

 fibrils about the walls of the acini, 

 known as the epilemmal plexus, from 

 which terminal fibrils pierce the base- 

 ment membrane and as hypolemmal 

 fibres end in contact with and be- 

 tween the secreting cells. Small 



terminal expansions, varicosities, or end knobs are found in the 

 course of the hypolemmal fibres. 



THE PANCKEAS 



The pancreas bears a close structural resemblance to the sali- 

 vary glands. It is a compound tubulo-acinar gland which contains 

 an immense number of small lobules and which pours its secretion 

 into the lumen of the duodenum by means of the pancreatic ducts 



FIG. 257. RECONSTRUCTION 

 MODEL OF THE SUBLINGUAL 

 GLAND OF MAN. 



An intralobular duct termi- 

 nating in intercalary ducts 

 and acini. x 285. (After 

 Maziarski.) 



FIG. 258. NERVE ENDINGS IN A 

 SALIVARY GLAND. 



H, demilune ; Z, secreting acini ; 

 w, nerve fibrils. Highly magnified. 

 (After Ketzius, from Eauber.) 



