224 ORGANS OE PREHENSION. 



cavity of the mouth, should first be filled with baked hair 

 or tow, (soft paper will answer,) and then sewed up. 



Levator Idbii superioris alceque nasi (Fig. 55) is a trian- 

 gular and thin muscle, situated between the orbit and upper 

 lip, and lying on the side of the nose. It arises by two heads, 

 one from the nasal process of the superior maxillary bone, the 

 other broad from the orbitary margin above the infra-orbi- 

 tal foramen; its fibres descend and are inserted into the 

 ala nasi and upper lip. 



Its function is to elevate the ala and upper lip. Its 

 superior portion is covered by the orbicularis palpebrarum, 

 and its orbital division is, by some, made a distinct muscle, 

 and called the levator labii superioris proprius. 



Depressor labii superioris alceque nasi is a small muscle 

 situated on either side of the frenum, and is seen by raising 

 the upper lip, and lifting the mucous membrane. It arises 

 from the surface in front of the alveoli of the incisor and 

 canine teeth, and ascends to be inserted into the upper lip 

 and ala of the nose. It lies upon the bone, and is covered 

 by the levator labii superioris alwque nasi and the orbicularis 

 vris. 



Its function is to depress the upper lip and ala nasi, and 

 antagonize the levator. 



Levator anguli oris (musculus caninus) is seen by raising 

 the levator labii superioris alaaque nasi which covers it 

 It arises from the canine fossa of the superior maxillary 

 below the infra-orbital foramen, having the infra-orbitar 

 nerves and vessels ramifying on its anterior surface. It 

 descends and is inserted into the angle of the mouth, inter- 

 mingling its fibres with those of the orbicularis, depres- 

 sor anguli oris, and zygomatic muscles. Its function is to 

 elevate the angle of the mouth. 



Depressor anguli oris (or triangularis oris) is a triangu- 

 lar, flat muscle, having its base below and apex above. It 

 arises fleshy and broad from the external oblique ridge of 

 the lower jaw, ascends converging, and is inserted into the 

 angle of the mouth, where its fibres blend with the levator 

 anguli, orbicularis, and zygomatic. Its function is to de- 



