Chap. V. The Anatomy of a HOP.SE. 5 5 



wards and downwards, the oblique move them obliquely, 

 and the circular Pair keep the Eyes Tufpended In their Place. 

 They all arife from the fame Origin, to wit, from the 

 Membrane that invefts the Orbit of the Eye, near the Hole 

 thro' which the Optick Nerve doth pafs, into the faid Orbit, 

 touching one another at their Beginning, but immediately 

 feparating into flelhy round Bodies, from which they again 

 degenerate towards their Termination into a thin membra- 

 nous Subftance, which is inferted into the horny Coat of 

 the Eye, eneompafling it as far as it is white. 



Thefe Mufcles have their feveral Appellations from their 

 feveyal Adions. The firft of the ftreight Mufcles, from 

 its Office of pulling up the Eye, is called AttoUens^ and in 

 Man fometimes Superbus ; as the fecond is call'd 1)eprimenSy 

 or Humilis. The third is call'd Jdducens, becaufeispulletti 

 the Eye towards the Nofe : And the fourth JbducenSy or 

 IndigtiatoriuSy from its Office of drawing the Eye to the 

 outer Corner ; which Turn or Afpedt of the Eye betokens 

 Anger or Scorn. 



When thefe Mufcles ad feparately, they have thefe four 

 feveral Motions ; but when they all co-operate or work to- 

 gether, they have but one tonick Motion, which is princi- 

 pally to keep the Eye fteady and fix'd ; but in Beaits that 

 have the fufpending Mufcle, that Adlion is performed 

 chiefly, if not altogether by it. 



The next are the two oblique Mufcles, which alio are 

 term'd the Circu?nagentes^ from their rolling the Eye about, 

 and are diftinguifhed by the Names of Major and ATinor ; 

 they being longer than the other, though fomewhat flen- 

 derer j the longer arifes from the fame Origin with thofe 

 above defcribed, and endeth in a fmall round Tendon, which 

 palleth through the tranfverfe Griille call'd Troclea, into 

 the inner Corner of the Eye. This rolleth the Eye inwards, 

 as the other (which riles from the Chink in the lower Part 

 of the Orbit, and has the fame Infertion with the Major) 

 rolls it towards its outward Corner. 



The feventh, or round Mufcle, is called the Sufpenfo' 

 rius, or feptimus "Brutorum^ being peculiar to Brutes only. 

 It is fhort and flefhy, encompaffi.ng the Optick Nerve, 

 and is inferted in the hinder Part of the Cornea. This 

 Mufcle is not only affiftful in the Tonick Motion of the 

 Eye, but is alfo ufeful to keep the Eye fufpended, left by 

 looking continually towards the Ground, it Ihould hang 

 too m»ch outward, 



E 3 § U. 



