6S The j^?iatomy of a HOKSE. Chap. V. 



Tii'o pairn<jhich The two Pair ot Mufcles wliich bring 

 bring the Shiul- the Shoulder forward, are called the one by 

 ier foriuards. the Name of P^^(7;v7//,j, and the other Co- 

 racoideus. The Pe^ oralis is To called from iis Situation on 

 the Forefide of the Bread. It arifes from the middle of 

 the Collar-bone ; its middle proceeds from the whole 

 LencTth of the Breaft. bone, and the Ends of the Griftles of 

 all thofe Ribs which terminate in it ; and its lower part 

 fprings from the fixth, leventh, and eighth Ribs. Its In- 

 fertion is with a broad and finewy Tendon into the Shoul- 

 der-bone, a little below its Head. 



The Coracoideus has its Beginning from the Procejfus 

 Coracoides^ from whence it reaches to the middle of the 

 Shoulder-bone, where it terminates. The Ufe of this and 

 the former is to draw the Shoulder forward. 

 -. . The following three Mufcles, to wit, the 



:tee move i Jnfrafpinatiis^ Subfcapularis, and Rotundus 

 minor, move the Shoulder backward. 

 The Irtfrafpinatus arifes from the Bafis of the Blade be- 

 low its Ridge, and is inferted by a broad and (hort Tendon 

 into the fourth Ligament of the Shoulder-bone. 



The Subfcapularis is feated between the Scapula and 

 Ribs, and is inferted into one of the Ligaments of the 

 Shoulder ; and the Rctundus minor, which arifes from the 

 lower Corner of the Scapula, is implanted into the Neck 

 of the Shoulder- bone. 



As to the circular Motion of the Shoulder, that is not 

 performed by any fingle Mufcle, but by feveral of thefe 

 aiieady named, ading fucceffively one after another, which 

 is eafily enough to be conceived by thofe who carefully ob- 

 ferve their Origins and Infertions, and the various Direc- 

 tions of their Fibres. But we fhall now proceed to thofe 

 that move the Fore-leg and Foot. 



_, The Fore leg is bended by two Mufcles, 



A 5 uv to wit, the Biceps, and Brachiaus inter nus. 



bend the tor?- The Biceps, fo called from its double 



Head or Beginning, ariling partly from the 

 upper Brim of the Shoulder-blade, and partly from the 

 Anchor- like Procefs of the fame Bone. This Mufcle be- 

 cometh ftrong and flefliy, and runs all along the Infide of 

 the Cubit- bone to the Knee, where it is inferted. Its Of- 

 fice is to bend the Cubit forward and fomewhat inwards. 



The fecond, Qr 'Jsrachiisus inter jius, h called in Man, 

 from its Situation on the Infide of the Arm,' and may 

 '. C - .•. pro- 



