116 



SPECIAL ANATOMY OF THE SKELETON 



from the upper to the lower border of the bone, and indicates the point of junctior 

 of the two pieces of which the bone is composed at an early period of life. Th( 

 lower part of the ridge terminates in a prominent triangular eminence, the menta 

 process (protuberantia mentalis). This eminence is rounded below, and ofter 



Coronoid process. 



Condyle. 



Groove for facial artery. 

 FIG. 86. The mandible. Outer surface. Side view. 



Angle. 



presents a median depression separating two processes, the mental tubercles (tubercuh 

 mentalia). It forms the chin, a feature peculiar to the human skull. On eithe 

 side of the symphysis, just below the cavities for the incisor teeth, is a depression 

 the incisor fossa, for the attachment of the Levator menti; more externally i 



Mylohyoid ridge. 



Body. 



FIG. 87. The mandible. Inner surface. Side view. 



attached a portion of the Orbicularis oris, and still more externally, a foramen, 

 the mental foramen (foramen mentale), for the passage of the mental vessels and 

 nerve. This foramen is placed just below the interval between the two bicuspid 

 teeth. Running outward from the base of the mental process on each side is a 



