Chap. V. The Anatomy of a HORSE. 57 



by which Means they move forwards, ftretching the Teeth 

 of the lower Jaw further out than thofe of the upper. 

 The lad Pair are call'd Pterygoidemn In- p.j-^^^ p^.^ 

 ternum : Thefe arife from the Cavity of the 

 Wedge- like Bone, and are inferted in the inner and hinder 

 Part of the lower Jaw. Their Ufe is to draw it backwards, 

 contrary to the former, and alfo airift the Temporal Muf- 

 cle in drawing it upwards. 



§. IV. Of the Mufcles of the Ears. 



The Mulcles of the Ears in Brutes, efpeci- The Mufcks ef 

 ally Horfes, Afles, Oxen and other Animals ^b' E^rs. 

 that have large Ears, differ much in Magnitude from thofe 

 in Man, they being indued with little or no Capacity of 

 Motion ; but that is made up in Man by the eafy Motion 

 of the Head, by which Means he can readily turn himfdf 

 to the hearing of all Sounds; whereas Four-footed Beafts, 

 wanting that Agility, need to have their Ears always move- 

 able, to receive the Sounds every way, and likewifc to drive 

 off Flies, and other Infeds that are troublefome to them, 

 which Men can do with their Hands. 



Now the outward Ear has four Mufcles, The outivani 

 •which are confiderably larger in brute Crea- Ear four Muf- 

 tures tlian in Man ; and the inward Ear has '^"• 

 TWO, which are proportionable in both. 



The lirft is called the attolem u^itrem, ^'^• 

 the Lifter up of the Ear : It arifes at the 

 Outlide of the Frontal Mufcle, from whence being carried 

 over the Temporal Mufcle, it is inferted in the upper Part 

 of the Ear, moving it upward and forward. 



The fecond is called detrahens Aurem, Second. 

 or the Puller-back of the Ear: This arifes 

 from the Mam miliary ProceileSj and is inferted into the 

 Root of the Griflle of the Ear. 



The third, or adducens Aurem^ by which T^hird. 

 the Ear is drawn forwards and fomewha-t 

 downwards, is implanted into the lower Side of the Root 

 of the Ear, and is only Part of the Mufcjilus quadratus^ 

 before fpoken of. 



The fourth, or abducens Aurem^ becaufe fourth. 

 it draws the Ear backward, takes its Begin- 

 ning at the Occiput^ or back Part of the Head, whe nee It 

 is carried tranverfely to the hinder Part of the Bye, into 

 v/hich it is inferted. This Mu(cle is allifting to the fecond. 



The 



