Chap. V. The Anatomy of a HORSE. s 5 



wards and downwards, the oblique move them obliquely, 

 and the circular Pair keep the Eyes fufpended in their Place. 

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

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

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

 touching one another at their Beginning, but immediately 

 feparating into flefliy 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, encompafling it as far as it is white. 



Thefe Mufcles have their feveral Appellations from their 

 feveral Anions. The firft of the ftreight Mufcles, from 

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

 Man fometimes Siiperbus ; as the fecond is call'd DeprimenSy 

 or Humilis, The third is call'd Adducens^ becaufe is pulleth 

 the Eye towards the Nofe : And the fourth Abducens, or 

 Indfgnatorius^ from its Office of drawing the Eye to the 

 outer Corner ; which Turn or Afpedl of the Eye betokens 

 Anger or Scorn. 



When thefe Mufcles a6l 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 lix'd ; but in Beafts 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 Circumagentes^ from their rolling the Eye about, 

 and are diftinguifhed by the Names of Major and Minor j 

 they being longer than the other, though fomewhat flen- 

 derer j the longer arifes from the fame Origin with thoie 

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

 palleth through the tranfverfe Griftle call'd Troclea^ into 

 the inner Corner of the Eye. This roUeth the E}e inwards, 

 as the other (which rifes from the Chink in the lower Pare 

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

 rolls it towards its outward Corner. 



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

 rius^ or fepti?nus Srutorum,, being peculiar to Brutes only. 

 It is (hort and flefhy, encompaifing the Optick Nerve, 

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

 Mufcle is not only afliilful in the Tonick Motion of the 

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

 looking continually towards the Ground, \i fliould har)g 

 too much outward. 



E 3 §n- 



