260 



THE DIGESTIVE ORGANS. 



portions of the system of ducts. The blood-vessels for each lobule 

 are quite distinct, forming only few anastomoses with those of 

 neighboring lobules. 



The Lymphatics. In the connective tissue surrounding and 

 separating the acini there are found clefts, which contain lymph. 

 These clefts are in part between the blood-capillaries and the base- 

 ment membranes. Lymph-vessels are found in the connective tissue 

 separating the lobules and lobes of the gland, in which they follow 

 the duct system. Lymph-vessels have not been found in the 

 lobules. 



Fig. 204. Model of a gland of v. Ebner, from a boy .fourteen years old; X J 7- 

 (Maziarski, " Anatomische Hefte," 1901.) 



The nerve supply of the salivary glands, may, owing to the im- 

 portance of these structures, receive somewhat fuller consideration. 

 Their nerve supply is from several sources. That of the sublin- 

 gual and submaxillary glands will be considered first. Sensory 

 nerve-fibers (no doubt the dendrites of sensory neurones, the cell- 

 bodies of which are situated in the geniculate ganglion) terminate in 

 free sensory endings in the large excretory ducts and their branches. 

 These medullated fibers accompany the ducts in the form of small 

 bundles. From place to place one or several fibers leave these 

 bundles and, after dividing a number of times, lose their medullary 

 sheaths. After further division the nonmedullated branches form 

 plexuses under the epithelial lining of the ducts. From the fibers 

 of these plexuses terminal fibrils are given off, which enter the 

 epithelium, to end, often near the free surface, on the epithelial cells 

 (Arnstein, 95; Huber, 96). The secretory cells of the acini receive 



