C HAP. V. The Anatomy ^/^HORSE. 71 



S. 27;-? Deltoidcs of the Thigh, fa calVd by Ur, Snape. 



T. The Serratus Pofticus. 



VV V. The external Intercollal Mufcles. 



VXY. The three 'Buttock Mufcies, ' 



Z. The Vaftus Externus. 



a. The Sacrolumbus. 



b. The Longiffimus Dorli. 



c. The Semifpinatus. 



§ X. Of the Mifcles of the Thigh, and thofe ivhich movi 

 the hind Leg and Foot, 



The Thigh of a Horfe comprehends that Part which 

 is between the Joint of the Huckle, or Whirle Bone, and 

 the Stifle. 



It is moved by feveral Mufcles, the firll of yr , ^ ^^ 

 which are call'd tlie Benders of the Thigh, ^highforxvard, 

 and are in Number three, viz, the Pfoas, 

 the Iliacus Internus, and Pe£fi7ieus, 



The firft of thefe arifes flefhy from the tranverfe Pro- 

 cefTes of the two lowermoll Vertebra of the Cheft, and 

 two or three uppermoft of the Loins, from whence, de- 

 fcending by the Infide of the Os Ileum, it ends in a ftrong 

 round Tendon, which is inferted into the Forefide of the 

 upper Part of the lefler Head of the Thigh-bone. The 

 Ufe of this Mufcle is to draw the Thigh upward, and 

 fomeward inward. 



The fecond, or Iliacus Inter nus, fpringeth with a ilen- 

 der flefhy Beginning from the Infide of the Haunch bone ; 

 and being join'd by its Tendon to the former Mufcle, is in- 

 ferted by a round Tendon into the lefler Head, or Rotator of 

 the Thigh bone. This Mufcle is alfo of Ufe to raife the 

 Thigh upward, tho' not fo much inward as the other. 



The Fe5lineus, which is the laft of thefe three Muf- 

 cles, arifes broad and flefhy from the Line of the Share- 

 bone, near the Griflle, and is implanted with a broad 

 and large Tendon into the lower End of the Thigh-bone, 

 This draws the Thigh upward and inward, and is that 

 Mufcle which, in Men, helps to lay one Thigh over the 

 other. 



This Mufcle, and all thofe that follow, excepting the 

 two laft, are inferted into the lower End of the Thigh- 

 bone, juft above the Stifle ; whereas in Men they are rnofl, 

 or all of them, inferted into its proper Part, either at its 

 F 4 Neckj 



