'64 The Anatomy of a HORSE. Chap. V. 



two upper fhort Ribs, fo that their Breadth takes up a great 

 part of the fide of the Cheft. Thefe co-operate with the 

 iirft Pair in widening the Cheft, as do alfo the two follow- 

 ing Pair, vi%. the Par [erratum pojlicum fuperius^ rifing 

 from the Spines of the three lower Rack-bones of the 

 Neck, and firft of the Back, and being inferted into the 

 Jnterjiices of the upper Ribs ; and the Par ferraium poflU 

 €Um inferius^ taking their Origin from the Spines of the ^hree 

 lowermoft Vertehrce of the Back, and firft of the Loins, 

 and having their Infertions into three or four lower Ribs, 

 before they run cartilaginous. 



Thefe four Pair, together with the Midriff, and the wi- 

 dening hitercofial Mufcles, dilate the Cheft in Infpiration, 

 that is to fay, in drawing in the Breath ; and the two 

 following Pair, to wit, the Triangulare and Sacrolum.^ 

 ^j p . buj?iy with the Internal and Liter cojiahy 



ihlt Tpre^tbe ^^prefs the Cheft in Expiration, or letting 

 Breaji, fo^^h the Breath. The triangular Pair 



having their Rile from the middle Line of 

 the Breaft-bone on its Infide, and their Infertion into the 

 bony Ends of the third, fourth, fifth, and fixth true Ribs : 

 And the other Pair taking their Origin from the Os facrumy 

 and Spine of the Loins, and having their Infertion into 

 the lower fide of all the Ribs, about three or four Fingers 

 Bri^adth from the Ridge of the Back. 



§ VIII. Of the Miifcle: of the Bad and Loins ^ ivlih thofe 

 of the Fundament and Bladder. 



Tour Pair com- The Mufcles of the Back and Loins are 

 mon to the Back ufually reckoii'd four Pair, which aie com- 

 and Loins. ^^^ {q \^q^^ 



The firft go by the Name of Long'iJfmU from their ex- 

 traordinary Length, being the longeft of the whole Body, 

 aiid endued with moft Strength. They arife from the Os 

 facrum and Haunch- bone, and palling by the Ridge of 

 the Loins, Back, and Neck, they reach to the mammillary 

 Proceiles of the Temple-bones. They are almoft confoun- 

 ded with the Par facrolumbwn, and the Semijpinatuf.ny in 

 their Paflage through the Loins, but arriving towards the 

 Back, they again part with them, and appear to be diliinift 

 from them. When both a6f together, they extend the Back 

 and Loins, but when they a(5f fingly, th&y incline the Spine 

 to one fide. They are of further Uie to moft Creatures, 



but 



