368 MUSCLES. 



lies immediately under the skin, and blends above with the zy- 

 gomaticus major and with the levator anguli oris. 



The Depressor Labii Inferioris, 



Is in part beneath the last muscle, and, like it, arises broad 

 and fleshy from the basis of the lower jaw on the side of the 

 chin; its fibres pass obliquely upwards and inwards, and are in- 

 serted into the whole side of the lower lip. 



It draws the lip downwards. 



These last two muscles are much obscured by being mixed 

 with a quantity of adipose matter ; the skin, also, is closely 

 blended with them, and the roots of the beard penetrate be- 

 tween the intervals of their fibres.* 



The Levator Menti, or Labii Inferioris, 



Being placed beneath the depressor labii inferioris, is demon- 

 strated by turning downwards the lower lip and dissecting away 

 its lining membrane on the side of the fraenum; it will then be 

 seen to arise in front of the alveolar processes of the external in- 

 cisor and the canine tooth, and, passing obliquely downwards, 

 to be inserted into the lower lip. 



It elevates the lower lip. 



The Buccinator, 



Arises from the root of the coronoid process of the lower 

 maxilla ; from the back part of the upper maxilla near the pte- 

 rygoid process of the sphenoid bone, and from the roots of the 

 alveolar processes of both the upper and the lower maxillary 

 bone, as far forwards as the denies bicuspides. It is inserted 

 into the corner of the mouth, and into the contiguous parts of 

 the upper and lower lips. 



It draws the corner of the mouth directly backwards. 



* Varieties. Its exterior border is often formed by the Platysma Myodes. 



