209 



CHAPTER XX 



DEMONSTRATION OF THE SECRETION OF SALIVA FROM THE SUB- 

 MAXILLARY GLAND OF THE DOO 



A dog is secured to the animal holder and placed under ether ; the 

 hair is then clipped from the jaws and neck and the skin cleaned with 

 a wet sponge. The necessary operation ' is then carried out in the 

 following stages : — 



1. Make an incision along the inner border of the lower jaw, 

 beginning about its anterior third, a little in front of the insertion of 

 the digastric muscle, and extend it backwards to the transverse pro- 

 cess of the atlas, dividing the skin and platysma. 2. Expose the 



Fig. 169. 



The Relation of the Veins to the Submaxillary Gl\m> in tiik 

 Dog. (After Bernard.) 



jugular vein (fig. 169) at or near the point where it divides into two 

 branches, A and P, and lay bare those branches also. One of them, 

 p, passes upwards behind the gland ; the other, a, passes forwards 

 below it and then divides into two branches. The gland itself has 

 two veins : one of them, v 1 , comes from its lower side and enters 



1 The description of the operation is taken from the Handbook for the Phi/sin- 

 logical Laboratory, by Brunton, Foster, Klein, and Sanderson. 



