Chap. V. The Aiiatomy of a HORSE. 71 



S. The Deltoides of the Thigh, fo calVd by Mr. Snape» 



T. The Serratus Pofticus. 



VW. The external Intercollal Mufcles. 



VXY. The three 'Buttock Mufcles, 



Z. The Vaftus Externus, 



a. The Sacrolumbus. 



b. The Longiflimus Dorfi, 



c. The SelTiilpinatuS. 



§ X. Of the Mufcles of the Thigh y and thofe ivhich mOVg 

 the hind Leg and Foot. 



The Thigh of a Horfe comprehends that Part which 

 is between the joint of the Huckle, or PVhirle Bone, and 

 the Stifle. 



It is moved by feveral Mufcles, the firfl of ^;, ^ z j .t 

 which are call'd the Benders of the Thigh, <ihilfor=ward. 

 and are in Number three, vi%. the Pfoas^ 

 the Iliacus Intemus^ and Peclineus. 



The firft of thefe arifes flefhy from the tranverfe Pro- 

 Ceflcs of the two lowermoft Vertehrcs of the Cheft, and 

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

 fcending by the Inlide of the Os lleum^ it ends in a ilrong 

 round Tendon, which is inferted into the Forefide of the 

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

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

 fomeward inward. 



The fecond, or Iliacus Intemus^ fpringeth with a flen- 

 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 lefTer Head, ox 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 PeiiineuSj which is the laft of thefe three Muf- 

 cles, arifes broad and flefliy 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, aild all thofe that follow, excepting the 

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

 bone, jufl above the Stife j whereas in Men they are moH, 

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

 F 4 Neck, 



