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 lail Pair are calPd Ptery^oideum In- pjM^p^^^ 

 ternim : Thefe arife from the Cavity of the -^ ' 

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

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

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

 cle in drawing it upwards. 



§. IV. Of the Mufcles of the Earu 



The Mufcles of the Ears in Brutes, efpeci- ^ke Mufcks of 

 ally Horfes, Afies^ Oxen and other Animals ^^<f E^r^- 

 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 Infers that are troublefome to them, 

 which Men can do with their Hands. 



Now the outward Ear has foiir MufcIeSj The mifward 

 v/nich are confiderabiy larger in brute Crea- Ear four Muf- 

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

 two, which are proportionable in both. 



The firil is called the attolem Jurem^ ^i^fi- 

 the Lifter up of the Ear : It arifes at the 

 Outfide of the Frontal Mufcle, from whence being carried 

 over the Temporal Mufcle, it is inferted in the upper Pari: 

 of the Ear, moving it upward and forward. 



The fecond is called detrahens Aureniy S-econd. 

 or the Puller- back of the Ear: This arifes 

 from the Mammillary Procefles, and is infected into the 

 Root of the Griltle of the Ear. 



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

 the Ear is drawn forwards and fomewhat 

 downwards, is implanted into the lower Side of the Root 

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

 before fpoken of. 



The fourth, or ahducem Aure?n^ becaufa Fourth, 

 it draws the Ear backward, takes its Begin- 

 ning at the Occiput^ or back Part of the Head, who nee it 

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

 which it is inferted. This Mufcle is affiiling to the fecond. 



Tlrp 



