56 The Anatomy of a HOKSE. Chap. V. 



The Orbicula. The odd Mufcle, or Orbicularis, fo cal- 



ris, or odd Jed becaufe it goes round both Lips, and 

 Mufcle, fometimes Conftringem, as it ferves like a 



Sphinder, to purfe up or contract the 

 Mouth, makes up the greateft Part of the Lips^ and has 

 all the other Mufcles inferted into it. 



§. III. Of the Mufcles of the lower Jaw, 



Ti've Fair be- The upper Jaw, being immoveable, hath 



longing to the no Pvlufcles, but the lower Jaw, having di- 



lo'u:erJa^M. vers Adlions, is moved by five Pair. 

 •r. n -D • 'i'lie fii'ft are called i\\QTe?Jiporal Mufcle Sy 



lirft Pair. . ^ , / . i , r,^ i 



•' becaufe they are feated on the 1 em pies. 



They fpring on each Side from the Bones of the Forehead, 

 the Sinciput, the Temples, and Os Cuue forme, or Wedge- 

 like Bone, and defcend under the Os Jugale, between the 

 Periofeum and Pericraniuni, to the acute Procefs of the 

 lower Jaw, into which they are inferted : Thefe Mufcles 

 pull up the lower Jaw, and fliut the Mouth. 

 Second Pair '"^^'^ I'econd Pair arife from the Styloid 



Procefs of the Temporal Bone, flefhy and 

 round towards their Origiuvbut lofe their flefliy Subftance, 

 and degenerate into a nervous and round Tendon, as they 

 approach the Flexure of the lower Jav/- bone; and then 

 becoming flefliy again, are inferted into the inner Side of 

 the lower Jaw, towards its middle or fore part; thefe be- 

 ing affifted by the ^ladrati above defcribed, pull down 

 the Jaw, and fo open the Mouth. 



Third Pair '^'^-"^ ^^""^^^ ^^^^^" ^^^ c-^Wt^ the Mafjeters, 



being very alliftant in the Office of chew- 

 ing, by moving the Jaw to the right and left Side ; each 

 of thefe hath two Beginnings, one from the Suture where 

 the fourth and liril Bone of the upper Jaw are joined ; and 

 the oiher from the Os Jugale, and are largely inferted into 

 the outfides of the lower Jaw : Thefe, by reafon of the 

 diverfity of their Fibres, move the Jaws divers ways. 

 Fcurih Pair ^^^^ fourth Pair are called Pterygoideum 



externum : Thefe have a double Beginning, 

 as the former, fpringmg partly from the upper and ouriide of 

 the Wing-like Procefs ot the Os Cuneiforme, or Wedge- like 

 Bone, and partly from the rough and (liarp Line of the faid 

 Bone, from whence defcenduig downwards, ihey are in- 

 :eried in tiie iniide of the Litem 1 Part of the lower Jaw; 



