Chap. IV. The Anatomy of a HORSE." 3 i 



CHAP. IV. 



Of the Upper Cavity^ or Head, 



§ I. Of its proper contain'mg Parts, 



A S the Parts already defcribM have always qigti j 

 •^^ been elleem'd the Seat of the Vital 

 faculty, fo the Head is accounted that of the Animal, it 

 being the Origin from whence all Senfations are deriv'd. 



The proper containins Parts of the Head r ^, ^ 

 are recKon'd to be thefe five ; namely, the tainmg Parts. 

 Mufdes, the Pericranium^ the Perio/teum^ 

 the Skull, and the Me?iinges, or Membranes contain'd vv'iihin 

 it : Leaving the Mufcles and the Skull to be treated of in 

 their proper Places, I fhall begin with the Pericranium. 



It is a very thin Membrane fpread over the whole Skull, 

 adhering every where to the Periojlevm, excepting where 

 the Temporal Mufcles come between them. There are 

 a great number of flender Fibres, v/hich pafs from it thro' 

 the Sutiira or Seams of the Skull to the iDura Mater^ or 

 uttermofl Membrane of the Brain \ which Fibres ferve to 

 ftay that Membrane in its Place, fo as to hinder the Brain 

 from being hurt by the hardnefs and unevennefs of the 

 Skull in violent ConcufTions of the Mufcles of the Head. 



The * Periofteutn, to which the Pericra?nu?n adheres, 

 isaSubilance of the fame Nature and Ufe, only that it 

 is fomewhat thinner. It is endued with an exquilite 

 Senfe, from whence fometimes arifes an exceffive Pain 

 when the Bones are wounded, they being themfelves alto- 

 gether infenfible. 



Thefe two Membranes have Arteries from the Card- 

 iids, and Veins from the external Jugulars, and are 

 chiefly of ufe to cover and defend the Skull from out- 

 ward Injuries, which otherwife would be expofed and laid 

 bare by every flight Accident. 



Immedia^tely under the Skull we obferve Dura Mater, 

 the t)ura Mater, io cali'd from its Tex- 

 ture, which is very firm ; and likewife, as it has been ge- 

 nerally believ'd to give Origin to molt Membranes through- 



D out 



* The Perioileum is belie-ved by modern Anatomijii to ts crJy «« 

 'j^xp^njion cf the 'Jf^a/^^^/; of the Mufcles of the Head, 



