Chap. IV. The JfJ atomy of a liOKSE. 41 



from thence running along the Bottom of the Brain ; after 

 increafing and growing broader, they are divided into a 

 great many I'wigs, which receive outer Coats from the 

 Dura Matei\ having only before a fmgle Integument from 

 the Pia Mater. Many of thefe Twigs pafs through the 

 Holes of the Sieve-hkc Bone to the Nofe, where they help 

 to compofe the Organs of Smelling. 



The fecond Pair are the O/i/zV, or feeing ThefecsnJ Pair. 

 Nerves ; thefe rile a little behind the former, 

 out of the iMedufui Oblongata : At their Rife they arc 

 fomewhat foft, being cover'd only with the Pia Mater ; 

 but as foon as they reach the Dura Mater ^ they become 

 cloathed by it, as the Olfactory Nerves above defcribed. 

 This outermoll Coat conllitatcs the Sclerotica^ or horny 

 Tegument of the Eye ; and from the Pia Mater proceeds 

 the next Coat of the Eye call'd the Uvea, from its Re- 

 femblance to a Grape in Colour: And laftly, the mar- 

 rowy Subftance forms the Retina., or Net- like, which by 

 fome is call'd its third Coat. 



The third Pair are call'd the Eye- TJ.-'e third Pair, 

 movers : Thefe arile from the Bottom of 

 the 'Medulla Oblongata : At the Rife they are united, which 

 is the Reafon why fome believe, when one Eye is carried 

 towards any Object, the other is alio direded towards the 

 fame. As the Optic Nerves pafs thro' the firft Hole of 

 the Wedge-like Bone, thefe pafs through the fecond, until 

 they come to the Mulcles of the Eye, where they are dif- 

 perfed ; by their aduating the Mufcles, the feveral Motions 

 of the Eye are performed. 



The fourth, or Pathetic/: Pair : Thefe The f our i/j Pair. 

 take their, .Rife different from all the rell, 

 viz. from the Top of the Medulla Oblongata, behind the 

 Nates and Te/hs, and pafluig along the Side of the Medulla.^ 

 are afterwards hid in the Dura Alater, until they reach the 

 Hole thro' which the laft Pair do pais, which they accom- 

 pany, until they are inferted in the Trochlear Mufcles of the 

 Eyes ; thefe are called by Dr. JVillis the Pathethick Nerves, 

 which move the Eyes in all PaOions and Affeftions. 



The fifth Pair take their Beginning in a ej^j^^ rr^j^ p^-^ 

 Horfe a little below the former, tho' in a hu- '' -^ ^ 

 man Subjed they feem to arife from the Cerebellum. Thefe 

 are made up of a Bundle of Fibres gather'd together, fo 

 that they look to be a Number of Nerves fpringing from 

 cne common Origin, which fend out Branches into all Parts 



of 



