72 The Anatomy of a HORSE. Chap. V. 



Neck, Or into one or other of the two Knobs at the lower 

 End of its Neck, called the great and lefler Trochanters. 

 Mr. Stwpe 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 and bulky upon its Buttocks, it was neceflary they 

 Ihould have feme Space to grow more ilender, and become 

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

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

 rhis 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. 

 *n h "d t •^^ ^^^'^ ^^^ ^'^^^ Mufcles which bend 



backward, ' ^^ Thigh forwards, it has the fame Num- 

 ber to bend it backwards. 



The firft is called Glutaus Exiernus, or the moft out- 

 ward Buttock Mufcle ; it arifes with a flefhy 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 ftrong 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 

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

 the other. It tifes 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 Hands to Stale. 



The third and lalt of the Extenders is called Glutaus 

 Minor, or lefler Buttock Mufcle ; it arifes round and 

 flefliy as high as the former, and defcending obliquely over 

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

 is inferted fomewhat towards its fore-flde. This aflifts the 

 other in its Adion. 



The Thigh is mov'd inwards by the TV/- 



tZSe ''P'^ °^' ^^^^^'^'"S to fome, the Quadriceps, 

 •^ •' ' from its having four Heads ; the firff: 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 flefhy at the lower Side of the 

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



The 



