Chap. VI. The Amtomy ^/^HORSE. 91 



2nd hollow, but arched on its Outfide ; it is joined to no 

 Bone but by its lower End, where it has a Cap that receives 

 the round Head of the Shoulder- bone : It is however knit 

 to feveral Parts by the Mufcles which are inferted into it, or 

 take their Origin trom it. It has three Procelles, the firft is 

 that Part which forms its Neck ; the fecond is extended 

 along the Middle of its Outfide, and is called its Spine. The 

 third is towards its lower and Infide, and from the Refem- 

 blance it has to an Anchor, is called Jnchoroides, or its An- 

 chor-like Procefs. 



It has alfo about its Neck five Appendages, three of which 

 afford an Original to ibme Mufcles, and from the other two 

 arife the Ligaments by which the Head of the Shoulder- 

 bone is tied into its Cup. Round its Brim there is a thick 

 Griftle, which not only makes its Cavity the deeper, that 

 the Head of the Shoulder-bone, which is joined into it, 

 iliould not fo eafily flip out, but alfo facilitates its Motion. 



The Shoulder-bone has two Heads, the fr/.r»cT4„«o 

 uppermolc inferted into the Cup or the j\ or Shoulder^ 

 Blade- bone, and the lowermolt joined to hone. 

 jhe upper Part of the Cubit or Leg-bone. 



The uppermoft Head is large and orbicular, cover'd with 

 a Griftle, and is, at firft, only an Appendix to the Cubit ; 

 but in time becomes a Procefs of the Bone itfelf ; on the 

 Outfide of- this orbicular Head there are two lefler Promi- 

 nences, into which two Ligaments are inferted ; and on its 

 Infide there is a Cavity, out of which arifes the ftrongLiga* 

 ment that ties it into the Cup of the Blade. 



The lower Head of this Rone, which in a human Body 

 is articulated with two Bones, viz. the Radius and UlnOy 

 is in a Horfe only united to one ; yet it is fo firmly cou- 

 pled to that one, that it cannot be eafily difplaced j for 

 there being three Procefles, and two Sifius's^ between it 

 and the Cubit, they both receive, and are received of each 

 other : And befides thefe Procefles, which ferve to its 

 Articulation, there is on each Side one, from whence arife 

 the Mufcles which lie on both Sides of the Leg. About 

 its Middle there is a Perforation, by which the Blood-vef- 

 iels have Recourfe to and from the Marrow contained 

 within its large Bore, and are thofe by which it is nou- 

 rifhed. 



The next Bone, call'd the Cubit, or Leg- T^e Cubit, or 

 f.one, reaches from the Elbow to the Shank. Leg-bane. 

 This Bone has on its hinder and upper Part a notable 



Pro- 



