Chap. II.] Mujcks of the Mouth. 145 



want to fmcll acutely j it alfo wrinkles the fkin of the 

 nofe. 



The mouth has nine pair of mufcles inferted into the . 

 lips, where their terminations form a fmgle mufcle, 

 which furrounds the mouth. One of the fe .rife s from 

 the upper jaw-bone, and is inferted into the angle of 

 the mouth. Its efFeft is to raife the corners of the 

 mouth, and it is therefore called the levator anguli oris. 

 2. The levator labii fuperioris ateque nafi. This rifes 

 by two diftincl: origins ; one of thefe proceeds from 

 the fuperior maxillary bone immediately below the 

 orbit, the other from the fame bone at the inner angle 

 of the eye. It is inferted partly into the upper lip and 

 partly into the outer part of the alas nafi, raifes the upper 

 lip towards the eyes and a little outwards, and alfo dilates 

 the noilrils, by drawing the ate nafi upwards and out- 

 wards. 3. The deprefTor labii fuperioris alaquas nafi, 

 arifes from the upper jaw-bone, where thedentes incifivi 

 and canini are fixed, and is inferted -into the upper lip 

 -and root of the ate nafi. When it acts, it draws the 

 upper lip and ate nafi downwards and backwards. 



The three mufcles of the mouth, already mentioned* 

 are fituated above, the three other pairs are placed be- 

 low. 



4. The depreffor anguli oris arifes from the lower 

 edge of the maxilla inferior, and is alfo connected to 

 the neighbouring foft parrs. It is inferted into the 

 corners of the mouth, and pulls them downwards. 

 5. The depreffor labii inferioris arifes from die inferior 

 part of the lower jaw-bone, near the chin, is inferted 

 into the edge of the lower lip, and pulls it downwards 

 and a little outwards. 6. The levator labii inferioris 

 arifes from the lower jaw, where the dentes incifivi and. 

 canini are fixed, and, being inferted into the under lip 

 and fkin of the chin, draws them upwards. 



VOL, III, L Three 



