i8 



The Anatomy of the Salivary Glands 



numerously in the region around the ducts and may be highly 

 developed. Spanner has also found these structures in the pancreas. 

 The appearances are reminiscent of the juxta-glomerular vessels in 

 the kidney. A further unusual vascular feature of the gland is the 



Terminal portion 



Muscle fibre 



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



human parotid gland. 



(Spanner, 1942.) 



presence of large sacculated veins (Spanner's Drosselvene or 

 throttle veins) which occur especially in the hilar region (Fig. 2.5). 

 These veins often appear as a saccular pocket developed in the side 

 of a small vein. Similar veins are found in a number of organs 

 including the penis (Clara, 1939). Spanner suggests that these veins 

 serve a reservoir function and also serve to back up pressure in the 



