THE HEAD AND NECK. 



29 



3. The mandible has a body and a ramus. On the body find : (i) The 

 mental foramen ; (2) the external oblique line ; (3) the alveolar process ; (4) the 

 symphysis menti ; (5) the mental tubercles ; (6) the incisive fossa ; (7) an internal 

 oblique line or mylo-hyoid ridge ; (8) a mandibular spine ; (9) a mandibular 

 foramen ; (10) superior and inferior genial tubercles ; (i i) a digastric fossa ; (12) 

 a submaxillary groove for the submaxillary gland. 



Zygomaticuo 

 major 



Zygomaticus 

 minor 



SURFACE COVERED BY 

 oocipito-frontalis 



Corrugator 

 superoilii 



Tendo oculi 

 Crbicularia 



palpebrarum 

 Levator labii supe- 



rioris alaeque nasi 



Levator labii 

 auperioria 



Levator anguli oris 



Compressor naris 



Depressor alee nasi 

 Orbicularis oris 



FIG. 10. THE SKULL. (Norma facialis.) 



The ramus has (i) a coronoid process ; (2) a sigmoid notch ; (3) a condylar 

 process. The condylar process consists of a condyle and a neck. 



ON THE FACE LOCATE (Fig. 10) : (i) The anterior nares ; (2) the nasal bones ; 

 (3) the temporal, frontal, orbital, and maxillary processes of the malar bone ; (4) 

 the supraorbital and infraorbital arches ; (5) the internal and external angular 

 processes of the frontal bone ; (6) the floor of the orbit, and in it the infraorbital 

 canal, containing an artery, nerve, and vein of the same name ; (7) the infra- 

 orbital foramen, the terminus of the infraorbital canal ; (8) the supraorbital 



