182 PRACTICAL ANATOMY. 



LEVATOR LABII SUPERIORIS. 



Origin Inferior margin of orbit. 



Insertion Upper lip. 



Nerve Facial. 

 LEVATOR ANGULI ORIS. 



Origin Canine fossa. 



Insertion Angle of mouth. 



Nerve Facial. 



QUADRATUS MENTI. 



Origin External oblique line of inferior maxillary, 

 internal to mental foramen. 



Insertion Lower lip. It is a depressor of lip. 



Nerve Facial. 

 TRIANGULARIS MENTI. 



Origin External oblique line external to quadratus 

 menti. 



Insertion Angle of mouth. It is a depressor of lip. 



Nerve Facial. 

 LEVATOR MENTI. 



Origin At each side of septum, incisive fossa below 

 alveolar process. 



Insertion Skin at lower part of chin. 



Nerve Facial. 

 ORBICULARIS ORIS. 



Origin Sphincter of the mouth. Consists of two 

 thick semi-elliptical planes of muscular fibres, which 

 surround the mouth. 



Insertion A few fibres are attached to the superior 

 maxillary and two conical fasciculi, pass upward to 

 the sides to the anterior nasal spine, and are inserted 

 into the upper lip. The depression between these 

 bundles is immediately below the septum nasi. 



Nerve Facial. 



