72 the Anatomy of a HOKSE. Chap. V. 



Neck, b'r into one or other of the two Knobs at the lower 

 End of its Neck, called the great ^nd leller Trochanters, 

 Mr. Snape thinks the Reafon of this Difference is owing 

 to the Shortnefs of the Thigh-bone of a Horfe, compared 

 with that of a Man, whereby his Mufcles being very- 

 plump add bulky upon its Buttocks, it was neceflary they 

 (hould have fome Space to grow more flender, and become 

 Tendinous ; and therefore, he fays, they are extended as far 

 as the Stifle, which anfwers to the Knee in Man. But 

 this is alfo Owing to the different Adion of the Thigh of 

 a Horfe from that of a Man, which manifeftly requires 

 its Mufcles to have a lower Infertion. 

 Three lend it ^^ ^^^^^ ^^^ ^"^^^ Mufcles vi^hich bend 



lack-ward, ^^^ Thigh forwards, it has the fame Num- 



ber to bend it backwards. 



The lirfl is called Glutaus Externus^ or the moft out- 

 ward Buttock Mufcle ; it arifes with a fiefhy Beginning 

 from the Crupper, the Ridge of the Haunch-bone, and 

 from the Os Sacrum, and pafling over the Joint of the 

 Huckle-bone, it ends in a llrong and broad Tendon, 

 which is inferted above the Stifle into the inner Part of 

 the Thigh-bone. Its Ufe is to extend the Thigh, and 

 enable an Horfe to go backward. 



The next is called the Glutaus Medius, lying in a Man 

 directly under the other, but in a Horfe Side by Side with 

 the other. It rifes from the Spine of the Haunch-bone, a 

 little higher than the other, and from thence defcends ob- 

 liquely over the Joint of the Hip, and is inferted into the 

 lower End of the outerlide of the Thigh-bone. Its Ufe is' 

 to extend the Thigh, and to draw it outward and back- 

 ward, as when a Horfe ftands to Stale. 



The third and lalt of the Extenders is called Glutaus 

 Minor y or leller Buttock Mufcle ; it arifes round and 

 iiefhy as high as the former, and defcending obliquely ovejr 

 the Joint of the Hip, to the lower End of the Thigh-bone, 

 is inferted fomewhat towards its fore- fide. This affifts the 

 other in its Adtion. 

 - - , . , The Thigh is mov'd inwards by the Tri- 



fZeMTick ''P'^ °^' ^^^or^^^ to fome, the Quadriceps, 

 ^ -' ' from its having four Heads ; the lirft Head 



rifing nervous from the upper Part of the Share- bone, and 

 defcending to the Infide of the lower End of the Thigh- 

 bone. The fecond beginning flefliy at the lower Side of the 

 fame Bone, and ending a little higher than the former. 



The 



