70 ANATOMY. 



Depressor Alae Nasi,from the incisive fossa of the superior maxillary, into 

 the septum and ala of the nose. Action, to contract the nostril. Nerve, 

 facial. 



Levator Labii Superioris, //row the lower margin of the orbit, into the 

 upper lip. Action, to elevate the lip. Nerve, facial. 



Levator Anguli Oris,0from the canine fossa of the superior maxillary, into 

 the angle of the mouth. Action, as named. Nerve, facial. 



Zygomaticus Major/* from the malar bone, into the angle of the mouth. 

 Action, to raise the lip outwards. Nerve, facial. 



Zygomaticus Minor,^ from the malar bone anteriorly, into the angle of the 

 mouth, blending with the levator labii superioris. Action, to raise the iip 

 outwards. Nerve, facial. 



Levator Labii Inferiorisw (Levator Menti),y>w;z the incisive fossa of the in- 

 ferior maxillary bone, into the integument of the chin. Action, as named. 

 Nerve, facial. 



Depressor Labii Inferioris^ (Quadratus Menti),yhwz the external oblique line 

 of the inferior maxillary bone, into the lower lip. Action, as named. 

 Nerve, facial. 



Depressor Anguli Oris (Triangularis Menti),/n?w the external oblique line 

 of the inferior maxillary, into the angle of the mouth. Action, as named. 

 Nerve, facial. 



Orbicularis Oris, by accessory fibres (accessorii orbicularis superioris and in- 

 ferioris, and naso-labialis)yh?/;z the nasal septum and the superior and in- 

 ferior maxillary borders, into the buccinator and other adjacent muscles, 

 forming the sphincter of the mouth. Action, to close the mouth. Nerve, 

 facial. 



Buccinator,/ from the posterior alveolar processes of both the maxillary 

 bones and the pterygo-maxillary ligament, into the orbicularis oris. Ac- 

 tion, to compress the cheeks. Nerves, facial, and the buccal branch of the 

 inferior maxillary. 



Risorius, from the fascia over the masseter muscle, into the angle of the 

 mouth. Action, the laughing muscle. Nerve, facial. 



Masseter/ from the anterior two-thirds and the inner surface of the zygoma 

 and the malar process of the superior maxillary, into the angle, ramus, and 

 coronoid process of the lower jaw. Action, to raise the back part of the 

 lower jaw ; a muscle of mastication. Nerve, inferior maxillary. 



Temporal, from the temporal fossa and temporal fascia, into the coronoid 

 process of the inferior maxillary. Action, to bring the incisor teeth together; 

 the biting muscle. Nerve, inferior maxillary. 



