Blood Supply i y 



to the periphery of the gland. There are, however, ' Venae comites" 

 running back along the ducts. In injected preparations Spanner 

 (1937) was impressed by the prominence of arteriovenous anas- 

 tomoses throughout the lobule (Figs. 2.5 and 2.6). They are most 



Fig. 2.7. (a) Epithelioid cells in the wall of a small arteriole in the 



human parotid gland. 



(Spanner, 1942.) 



prominent in the region of the ring vessels and are not very 

 frequent in the duct wall. Some of these anastomoses are of con- 

 siderable size. In many of the small arteries of the gland an extra- 

 ordinary appearance of large epithelioid cells is seen in the wall of 

 the vessels (Spanner, 1942, Fig. 2.7). These arteries are found most 



P.S.G. — C 



