30 A MANUAL OF DENTAL ANATOMY. 



at a point a little distance from the mental prominence is 

 the external oblique line, which becomes merged in the base 

 of the coronoid process. Where it rises as high as the 

 alveolar border, i.e., opposite to the third and sometimes the 



FIG. 14 ( l ). 



second molar, the outer alveolar plate is strengthened by it, 

 so that it becomes less yielding than the inner plate. The 

 student should bear this fact in mind when extracting a 

 lower wisdom tooth. 



The buccinator is attached to the alveolar border oppo- 

 site to the molar teeth ; the platysma myoides to the outer 

 side of the lower border along a region somewhat further 

 forward : the masseter over the whole outer face and border 

 of the ascending ramus and the temporal to the apex and 

 side of the coronoid process. The other muscles attached 

 to it are facial muscles of expression. 



On the inner surface of the body are four tubercles, 

 situated in pairs in the median line, about opposite to the 

 ends of the roots of the incisors, but somewhat variable both 



(*) Lower Maxillary Bone. 2. Ramus, where masseter is attached. 

 3. Symphysis. 5. Mental foramen. 6. External oblique line. 8. Angle 

 of jaw. 9. Internal oblique line. 10. Coronoid process. 11. Condyle. 

 12. Sigmoid notch. 13. Inferior dental foramen. 



