Chap. V. The Jnatomy of aloiOKS^. 67 



The laft Pair, called Rhomboides, are feated under the 

 Cucullares^ 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 the Chcft, and are 

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

 being to draw them fomewhat upwards and backwards. 



The Shoulder has five feveral Motions en n, ,, 

 perform d by nine Aiufdes, to wit, back- „;^^^ Mu/des. 

 wards, downwards, and circularly. 



But before I proceed to a Defcr>ption 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 diltinguiflied 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 De hoi des, q- v s 

 • from its Figure refembling the Greek Letter 

 ^. It arifes fiefhy from the midit 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 its 

 chief and principal Ufe, but by the various Direction of 

 its Fibres, it aflifls in other Motions, but elpecially in that 

 which is circular. 



The fecond Ere6lor of the Shoulder is named Suprafpina' 

 tiis^ 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 flefhy Beginning, and is inferted into the Neck 

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



The LatifTimus and Rotundus major, are a- r» ^ /r 

 the two Deprenors of the Shoulder ; the hrft ^ -^ 



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

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

 Spines of the Rack- bones that are between the fixth Vertt" 

 bra of the Chell, 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 Deprejjor^ which is the fourth Mufcle of 

 the Shoulder, called Rotundus major^ takes its Origin 

 from the lower Cojia 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 % T}io 



