ANTERIOR ASPECT OF HEAD AND NECK. 



Depressor Alae Nasi. Origin; upper part of incisor fossa. 

 Course; splits into two parts. Insertion; ala and septum of 

 nose. [403] 



Levator Labii Inferioris Alseque Nasi. Origin; root of 

 nasal process of superior maxilla. Insertion ; Orbicularis oris ; 

 ala of nose. [403] 



Orbicularis Oris. This sphincter surrounds the lips. Its 

 mesial fibres are attached above to the septum of the nose and 

 the incisor fossa, and below to the lower jaw on each side of 

 the symphysis ; they radiate outward to the rest of the muscle. 

 Laterally its upper fibres join the Buccinator and Depressor 

 anguli oris, and its lower fibres the Buccinator and Levator 

 anguli oris. [403] 



Levator Labii Superioris. Origin ; superior maxilla above 

 the infra-orbital foramen. Insertion; skin of upper lip; Or- 

 bicularis oris. [403] 



Levator Anguli Oris. Origin; canine fossa. Insertion; 

 Orbicularis oris; skin at angle of mouth. [403] 



Zygomaticus Minor. Origin; malar bone. Insertion; Or- 

 bicularis oris. [404] 



Zygomaticus Major. Origin; malar portion of zygoma. 

 Insertion; Orbicularis oris ; skin at angle of mouth. [404] 



Risorius. Origin; masseteric fascia. Insertion; Orbicu- 

 laris oris; skin at angle of mouth. [404] 



Depressor Anguli Oris. Origin; Platysma; external ob- 

 lique line of lower jaw. Insertion; Orbicularis oris; skin at 

 angle of mouth. [404] 



Depressor Labii Inferioris. Origin; lower jaw. Insertion; 

 Orbicularis oris; skin of lower lip. [404] 



Levator Menti. Origin; incisor fossa. Insertion; skin of 

 chin. [404] 



Buccinator. Origin; alveolar arches of both jaws; pterygo- 

 mandibular ligament. Insertion ; Orbicularis oris, the middle 

 fibres decussating at the angle of the mouth but the upper 

 and lower fibres passing directly to it. [404] 



[61] 



