Chap. IV. The Anatomy ^/ ^ H O R S E. 3 5 



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

 Oblongata, and Pith of the 'Bach 



The Brain of a Horfe » much lefs in <^^^ p^ . 

 Proportion than the Brain of a Man ; but is 

 compofed of a Medullary Subftance, and has moft orallthe 

 fame Parts which are difcoverable in a human Head. 



It is divided into three Parts, vi%. the Cerebrum^ Cere- 

 helium^ or Brainlet, and the Medulla oblongata. 



The Cerebrum contains all that Subftance which lies 

 uppermoft in the Head, and which is divided into two 

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

 afliy Colour, and formed into feveral Convolutions and 

 Wiudings, but not with any vifible Regularity, as the Ce- 

 rebellum ; its Infide is white, and therefore called the Corpus 

 callofum. 



The Cerebellum is divided from the Ce- trr Cpxeh I- 

 rebrum by a Production of the Pia Mater ^ )^^ ^^ Brain' 

 ■which alio affords a particular Cover to aii /et. ' 

 itis 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 ; the other two 

 are in the Middle, {landing before and behind ; they are 

 fomewhat orbicular, and are called the Proceffus Vermlcu' 

 lares., from the Refemblance they bear to the Worms in 

 rotten Timber. 



The Medulla Oblongata., is the Begin- ^-a xt j n 

 ning of the Spinal Marrow ; it is of en uni- oblon ata 

 form, white, and compa<5t 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 palTes out at 

 the Noll., whence it is continued aloDg the Chine down- 

 wards to the Fundament, and through all that Paflage is 

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

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

 Membrane, v.'hich forms its outcrmoft: or third Coat, and 

 is faid to arife from a ftrong 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 View o^ its Parts fomewhat more nar- 



D 2 towly. 



