Chap. V. The Anatomy ofaHOKSE. 67 



The laft Pair, called Rhomboides^ are feated under the 

 Cuctillaresy and take their Origin from the hinder Procefles 

 of the three lowermoft Spines of the Rack-bones of the 

 Neck, and from the three uppermoft of rhe Cheft, and are 

 implanted into the Bafis of the Shoulder-blades, their Ufe 

 being to draw them fomewhat upwards and backwards. 



The Shoulder has five feveral Motions ctl ol u 

 perform d by nine Mufcles, to wit, back- nineUufiles! 

 wards, downwards, and circularly. 



But before I proceed to a Defcription of its Mufcles, 

 it will be proper to intimate, that although the Shoulder- 

 blades in Horfes are generally taken for part of the Shoul- 

 der, yet Anatomifts have always diftinguiflied between the 

 Shoulder-blade and Shoulder, accounting that Part only to 

 be the Shoulder, which is joined to the Shoulder-blade, and 

 reaches towards the Elbow. 



The firft of its Mufcles is called Deltoides^ T E a 

 from its Figure refembling the Greek Letter '^^ 

 A. It arifes flefhy from the midft of the Collar-bone to the 

 Top of the Shoulders, and the whole Ridge of the Shoulder- 

 blade, and is inferted in the middleof the Shoulder-bone. 



This Mufcle not only raifes up the Shoulder, which is it^ 

 chief and principal Ufe, but by the various Dire<5tion of 

 its Fibres, it afliils in other Motions, but efpecially in thac 

 which is circular. 



The fecond Ere6lor of the Shoulder is named Suprafplna- 

 iusy becaufe it fills all that Cavity which is between its Spine 

 and upper Edge. It arifes from the Spine of the Blade, with 

 a long and fleftiy Beginning, and is inferted into the Neck 

 of the Shoulder- bone by a ftrong and broad Tendon. 



The Latijfimus and Rotundus major^ are n- n -h rr ^ 

 the two Deprefibrs of the Shoulder -, the firft ^'^'^'r'JJoyh 

 is fo called from its Breadth ; for with its Fellow it almoll 

 covers the whole Back. It arifes from the Tops of all the 

 Spines of the Rack-bones that are between the fixth Vertex- 

 Ira of the Cheft, and the middle of the Os facrum^ as alfo 

 from the upper part of the Haunch- bone, and is inferted 

 below the upper Head of the Shoulder-bone lengthways. 



The fecond Deprejfor^ which is the foui-th Mufcle of • 

 the Shoulder, called Rotundus major^ takes its Origin 

 from the lower Cofla of the Shoulder-blade, and is inferted 

 into the upper and inner Part of the Shoulder-bone. The 

 Ufe of this, and the laft defcribed, is to pull the Shoulder 

 downward. 



F 1 Jte 



