62 The Airaromy ^^/^ ^ H O R S E. Cf^ap. V. 



When thefe ad together, they bend the Head forward, but 

 •when kparately, they draw it a httle to one Side. 



The Sl>linium is reckoned the fecond Pair, being tl)e 

 firft of ihofe which pull back the Head ; they arife from 

 the five uppermoft Vertebra of the Chell, and the five 

 lowernjoil of the Neck, with a nervous Beginning, afcen- 

 tiing to the hinder part of the Head, where they ate infert- 

 ed. When thefe ad together, they draw the Head back- 

 ward ; but when they ad fingly, they draw it a httle to 

 one Side. 



The third Pair, named Ccmplexvir., or Trigeminumy 

 becaufe each of them arife wi:h three Heads j two from 

 the firft, fecond, fourth, and fifth tranfverfe ProceiTes of 

 the Cheft, and the third from the Ridge of the feventh Ver- 

 tebra of the Neck j all which uniting together, are inferied 

 in the Noll- bone. 



The third Puller back of the Head, or fourth Pair, 

 called Parvum Crajfum : Thefe are fituated under the for- 

 mer, arifing nervous from the tranfverfe Procelles of the 

 fix uppermoft Vertebra of the Neck ; but afterwards be- 

 coming fleftiy, are carried obliquely upward, and are infert- 

 ed into the hincermoft Root of the Procejfus mammillaris. 

 When thefe acl: lingly, they incline the Head lightly back- 

 ivard to one Side ; but when they act together, they bring 

 it ftreight backward. 



The Rectum majus and Reolum minus , which make up 

 the fifth and fixth Pair, are feated one under the other, and 

 are both inferted into the Noll, aftifting the fourth Pair in 

 their Adion. 



The Obliquum fuperius^ which is accounted the feventh 

 Pair, arife from the Middle of the tranverfe Proceiles of 

 7he firft Vertebra of the Neck j their Ufe being to nod the 

 Head backwards. 



The laft Pair, called Obliquum infenus^ take their 

 Origin from the Spine or Ridge of the fecond Vertebra 

 of the Neck, and forming an oblique Courfe, terminate in 

 the tranfverfe ProceiTes of the firft Veriebra^ being of Ufe 

 To move the Head femicircularly. Now the Reafon why 

 there are fo many Mufcles appointed to move the Head 

 backwards, is becaufe of its great Bulk and Weight i by 

 which Means it is of itfelf prone enough to incline for- 

 ward and downward, fo that it wants not only a Stay, 

 but requireUi a greater Force to move it upward or back- 

 ■WSird. 



The 



