Chap. VI. The Anatomy of a HORSE. %$ 



bone, and to its back Part. It has likewife two Perfora- 

 tions, one on either lide, which have Communication with 

 the two Holes of the Wedge-like Bone. 



The lower Jaw, which makes the lower part T^f^e lo'werjaivt 

 of the Capacity of the Mouth, comes next ivith its Parts. 

 to be treated of. This differs from the former, in that it 

 is moveable, whereas the other is not. At both Ends of \K. 

 there are two Procelles, the foremoft of whicji running up- 

 wards, and from a broad Balis growing fharp, ends in a 

 Cone or Point. It is this Point that receives the Tendon of 

 the Temporal Mufcle ; from whence it is, that a Luxation 

 of the lower Jaw is very dangerous, if not fpeedily reduced. 



The other, which is the backward Procefs, is called Arti^ 

 cularis^ having a Neck and a longifli Head covered with a 

 Griftle, by which it is received and articulated into the Sinus 

 of the Os petrofu?n ^'2iX\<\ it isflrongly knit thereto by a mem- 

 branous Ligament. It hath, at the Sides of thofe ProceiTes, 

 fmall fhallow Cavities, for the Lodgment of its Mufcles. 

 Towards its back Part it hath a Cavity within it, which con- 

 tains a marrowy Juice for itsNourifliment. It has alfo four 

 perforations or Holes, whereof two are at the Roots of the 

 Procelles, by which a Vein and Artery, as alfo a Branch of 

 the fifth Pair of Nerves do pafs to the Teeth. The other 

 two are in its Fore-part, giving Way to two Twigs of the 

 faid Branch, which go out to the lower Lip. 



But the lower and upper Jaw have Sockets for the Teeth 

 to (land in, which by Reafon of their Depth, have been 

 called Jlveoli : When any of the Teeth fall out, as the 

 Foal Teeth^ &c. thefe Pits foon become obliterated, and the 

 Jaw grows fmooth. 



The Teeth are of a Subftance harder than ^^^ ^^^^ 

 any of the other Bones, which is abfolutely 

 necellary, confidering their Office is to break and cut all 

 the Aliment. That Part of them which ftands out abovp 

 the Gums, is fmooth and free from any Covering, but all 

 within the Sockets of the Jaws is more rough, and covered 

 with a thin Membrane of exquifite Senfe. Thofe which 

 are called Grinders^ have a manifeft Cavity within them, 

 but the Fore- teeth and Dog-teeth have but very obfcure 

 ones. By the frnall Holes which are difcernable in the 

 Roots of the Teeth, is conveyed into thefe Cavities a capil- 

 lary Branch of an Artery from the Carotidsy a fmall Vein 

 from ihtjugularsy and a Twig of a Nerve from the fifth 

 fair, which being expanded through the thin Membrane 

 G 3 that 



