Chap, IV. The Jnatom of a KOKSE, 35 



§ II. Of the 'Brain and Cerebellum, whh the Medulla 

 Oblongata, and Pith of the "Back, 



The Brain of a Horfe is much lefs in the B a 

 Proportion than the Brain of a Man ; but is 

 compofed of a Medullary Subftance, and has moft or all the 

 lame Parts which are difcoverable in a human Head. 



It is divided into three Parts, vl%. the Cerebrum^ Cere* 

 helluTu^ or Brainier, and the Medulla oblongata. 



The Cerebrum contains all that Subitance which lies 

 uppermofl in the Head, and which is divided into two 

 Halves by the Falx above defcribed : Its Outlide is of an 

 a{hy Colour, and formed into feveral Convolutions and 

 Windings, but not with any vifible Regularity, as the Cer 

 rebellum \ its Inlide is white, and therefore called the Corpm 

 (alio (urn. 



The Cerebellum is divided from the Ce- ^-^^ ^^ , . 

 rebrum by a Prodiadlion of the Pia Mater ^ ^^^ ^^ Brain- 

 which alfo affords a particular Cover to ali /^/^ ' 

 its Folds, which keeps them feparate and 

 apart from each other. This is made up of four Parts, 

 whereof two are lateral, one on each Side j the other two 

 are in the Middle, Handing before and behind ; they are 

 fomewhat orbicular, and are called the Proceffui Vermicu- 

 lar es^ from the Refemblance they bear to the Worms in 

 rotten Timber. 



The Medulla Oblongata^ is the Begin- ^r , , , ., 

 ning of the Spinal Marrow 5 it is of an uni- oblon" t ' 

 form, white, and compad Subftance, hard- "^^ ** 



er than the Brain or Cerebellum. It arifes from fix Roots, 

 two ofwhichfpringfrom that Part of the Brain, which is 

 called the Corpora flriata ; the other four arife lower, 

 and more backward, from thofe Protuberances which are 

 term'd the Nates and Tefles, It is round, being in length 

 about two Inches within the Head, before it pailes out at 

 the Noll^ whence it is continued along the Chme down- 

 wards to the Fundament, and through ail that Paflage is 

 term'd the Spinal Marrow or Pith of the Back. This 

 has, befides the Pia Mater and Dura Mater., another 

 Membrane, which forms its outermoit or third Coat, and 

 is faid to arife from a Itrong Ligament which binds toge- 

 ther the fore- part of the Rack- Bones. 



But before I proceed to the Ufe of the Brain, it will not 



be amifs to take a \'iew of its Parts fomewhat njore nar* 



D 2 rgwl^Tg 



