(54 The Anatomy of a, HORSE. Chap. V. 



two upper fhort Ribs, {o that their Breadth takes up a grSat 

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

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

 ing Pair, VIZ. the Par [erratum pojl'i cum fuperius, rifrng 

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

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

 Ifiterjiices of the upper Ribs ; and the Par jerratum po/li- 

 cum inferius^ taking their Origin from the Spines of tire three 

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

 and having their Infertions into three or ^our lower Ribs, 

 before they run cartilaginous. 



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

 dening Intercojlal Mufcles, dilate the Cheft m Infpiration, 

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

 following Pair, to wit, the Triangulare and Sacrolum- 



cri D • bum., with the Internal and Intercoftah^ 



The tivo Pair , V l /-il n. • t- • ■ i • 



that detrefs the «lepreTs the Cheft m Expiration, or letting 

 Breafl^ forth the Breath. The triangular Pair 



having their Riie 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 Oi facrum^ 

 and Spine of the Loins, and having their Infertion mlo 

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

 Breadth from the Ridge of the Back. 



§ Vlir. Of the Mufcles of the Bach and Loins ^ with thofe 

 of the Fundament and Bladder^ 



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

 tnon to the Back ufually reckon'd four Pair, which are com- 

 and Loins. ^^^ [q both. 



The firft go by the Name of Longiffimi., from their ex- 

 traordinary Length, being the longeft ot the whole Body, 

 and endued with moft Strength. They arife from the Oi 

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

 the Loins, Backhand Neck, they reach to the mammilhry 

 Procefies of the Temple- bones. They arc almoft confoun- 

 ded with the Par facrolumbum^ and the Semi/pi?jatum^ in 

 their Paflagc through the Loins', but arriving towards the 

 Back, they again part with them, and appear to bs diftindl 

 from them. When both ad togeiher, they extend the Back 

 and Loins, but when they ad lingly, they incline the Spine 

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



but 



