1 56 ANATOMY AND PHYSIOLOGY FOR NURSES 



gone various changes, it yields its particles to the blood 

 in the form of chyle. 



Mastication. By mastication is meant the tritura- 

 tion of food, a process accomplished by the teeth and the 

 lower jaw, under the influence of muscular contraction. 



FIG. 75- General plan of the branches of the fifth pair: I, Lesser root 

 of the fifth pair; 2, greater root, passing forward into the Gasserian gan- 

 glion ; 3, placed on the bone above the ophthalmic division, which is seen 

 dividing into the supra-orbital, lacrimal, and nasal branches, the latter con- 

 nected with the ophthalmic ganglion ; 4, placed on the bone close to the 

 foramen rotundum, marks the superior maxillary division ; 5, placed on the 

 bone over the foramen ovale, marks the inferior maxillary division (after a 

 sketch by Charles Bell). 



At the same time the food becomes mixed with saliva and 

 softened. When thoroughly divided, the food presents 

 a greater surface for the solvent action of the digestive 

 fluids, thus aiding the general process of digestion. 



The lower jaw is capable of making a downward, an 

 upward, a lateral, and an anteroposterior movement, 



