Chap. VI. The Anatomy ^/^HORSE. 87 



That Bone is called Hyoides, from lis The Os Hyoi- 

 Shape, being like the Greek Letter v {Tpfi^ ^es, or Bone of 

 Ion). It is Tea ted at the Root of the Tongue, '^^ tongue. 

 being the Foundation or Supporter of it. It is made up of 

 three Bones, the middlemoft being gibbous outwards, but 

 inwards fomew hat hollow ; The other two are called its 

 Corjtuo^ or Horns, and are all tied to the adjacent Parts by a 

 Subftance which is partly nervous, and partly flefhy. 



This little Bone is of great Ufe ; all the Mufcles that 

 move the Tongue bemg either inferted into it, or taking 

 their Origin from it. It alfo gives Rife to fome of thofe 

 Mufcles that move ihtLaryfix^ or Throttle, and is a reft- 

 ing Place to the Epiglottis^ or Throat-flap, when it is 

 lifted up in Breathing. 



§ III. 0/tbeVenthrx of the Ned. 



The Neck is made up o^ kvtn Vertebra^ The Vertebrse 

 or Rack-bones, reckoning from the Head <f the Neck. 

 downwards, that next the Head being the iirft ; they have 

 each of them a large Cavity, to give Way to the Spinal 

 Marrow : And befides this large Hole, which they have 

 in common with all the other Vertebra., they have each 

 two fmall Perforations in their tranfverfe ProcelTes, through 

 which the cervical Veins and Arteries do pafs to the Head ; 

 and between their Joinings there is a third found, partly out 

 of the lower fide of the upper Vertebra^ and partly out of the 

 upper fide of each lower Vertebra^ by which the Nerves pafs 

 outward from the fpinal Marrow. 



The fitft of thefe Bones, in a human l^hefirft is cal- 

 Skeleton, is called Atlas, becaufe the Head ^^^^^e Atlas, 

 is articulated to it, and, as it were, fupported by it ; and 

 may therefore retain the fame Name in a Horfe. Its Body 

 is flender, but more folid than the Tips of its ProcefTes, 

 which are porous and open ; inflead of its hinder Spine or 

 Procefs, it has only a femicircular Prominence jetting out, 

 left the larger ftreight pair of Mufcles, w^hich pafs over it, 

 (hould be hurt in bending the Head forwards ; but it has all 

 its other Procefl'es in common with the reft. On the Forefide 

 of its great i^7rjw^;; inwards, it has a fmall Socket fomewhat 

 femicircular, and lin'd with a Cartilage, to receive the Tooth- 

 like Procefs of the fecond Vertebra. 



The fecond Vertebra is, becaufe of this The/econdDen-^ 

 Procefsj called Dentata j it is an Appendix, tata. 



G 4 which 



