INFERIOR EXTREMITY OF THE HEAD 



77 



The movements are elevation, depression, extension, retraction, and 

 lateral inclination. Each changes the form and volume of the organ ; 

 it becomes wider, thicker, concave or convex, etc. 



FIG. 26. Examination of the mouth. 



The volume, in general, is proportional to the capacity of the buccal 

 cavity. We have never observed, except in very old horses, that the 

 thickness of this organ caused it to project beyond the bars, become 

 the sole support of the shank of the bit, and lessen, for this reason, 



