CkAP. VI. The Anatomy of a HORSE. %x 



they are joined to the Temple- bones. They are frnooth' 

 on their Outlide, but inwardly uneven, having feveral Ca- 

 vities to which the Dura Mater adheres by the Sides of 

 the Sagittal Suture ; as alfo feveral long and winding In- 

 fcriptions, or Furrows, form'd by the Branches of the In* 

 UrnaX Jugulars^ in their Paflage to the Brain. Thefe 

 Bones have ahb feveral Perforations ; fome of which go 

 quite through, others piercing only the upper Table, for 

 the Entrance of thofe Veilels which run between its Plate?. 



The Occipital^ or Noll- bone, which makes ^^^ Nollhone 

 the hinder and lower Part of the Head, and ^^,-^1^ -^^ parts, 

 middle of the Bafis of the Skull, is the 

 hardeftof all the Bones of the Skull, excepting the Os Pe- 

 trofum of the Temple-bones, being very thick at Bottom, 

 where the two Si?im*s of the Dura Mater are joined. 

 At the Sides of the great Perforation, through which the 

 Spinal Marrow defcends, it is fome what thin ; but that 

 its Thinnefs might be no Prejudice to it, it is i\rengtherr'd 

 by a large Prominence, which afcends from the faid 

 Perforation quite to its upper Part. By this Prominence 

 the two Protuberances of the Cerebellum are alfo dillin- 

 guilhed.- . _ 



This Bone is in a Horfe five-corner'd, and has feveral 

 Channels, or Sinus's, two of which, being pretty large, 

 receive the Protuberances or Bunchings of the Cerebellum, 

 or After-brain ; others receive fome of the Convolutions of 

 the Brain itfelf, and fome, the two SinuCs of the Dura 

 j[i'Iater, that they might not be compreiled or hurt for 

 Want of a proper Cavity to lie in. 



It has alfo divers ProcefTes, four of which, being covered 

 with a frnooth Griltle, are received into the Sinus's of the 

 firft Vertebra of the Neck ; but that which goes between 

 the Protuberances of the Cerebellum, is the moft confider- 

 able. It is perforated in five Places, for the Paflage of fe- 

 veral Veilels, befides the large Hole through which the 

 Medulla goes into the Spine of the Neck. 



The lalt of the proper Bones of the Skull, ^^^^ Temple- 

 are the Temple-bones, which are feated on ^ones, '•Mith 

 each fide of the Head, reaching to the Bot- thnrjxozz^^ 

 tom of the Ears. Their Figure is on their '»''^^^""^^- 

 upper fides femicircular, but below they are rugged and 

 unequal, like a Rock ; from whence, and from their Hard- 

 nefs, the Temple-bone has alfo obtained the Name ot Oi 

 Petrofum. Thefe Bones are verv thick at their Bottom,- 



G ' bul 



