144 Mufcles of the Eye &nd Nofe. Book IX. 



torn of the orbit around the foramen, through which 

 the optic nerve paries, and are extended to the ford 

 part of the globe of the eye. Thefe mufcles are named 

 from their life. The levator oculi raifes the ball of the 

 eye, the depreffor pulls it down, the adductor turns the 

 eye towards the nofe, and the abductor moves the globe 

 outwards. The two oblique mufcles are, the obliqims 

 fuperior or trochlearis, which, rifing from the bottom 

 of the orbit, runs along the pars plana of the ethmoid 

 bone to the upper part of the orbit, where its tendon 

 paffes through a cartilaginous ring connected to the 

 os frontis, by which mechanifm the direction of its 

 force is altered, and its tendon afterwards proceeding a 

 little downwards, and directed outwards at the fame 

 time, is inferted half way between the infertion of the 

 attollens oculi and optic nerve. The effect of this 

 curious mufcle is to roll the eye, to turn the pupil 

 downwards and outwards, and to draw the whole ball 

 nearer to the nofe. The obliquus inferior arifes from 

 the orbitar procefs of the fuperior maxillary bone, and 

 running obliquely outwards is inferted in the fpace be- 

 tween the abductor and optic nerve. Its ufe is to 

 draw the globe of the eye forwards, inwards, and down- 

 wards, and, contrary to the fuperior oblique, to turn 

 the pupil upwards towards the inner extremity of the 

 eye-brow. By acting fucceflively with all the mufcles 

 of the eyes we are able to roll them. 



The nofe is affected by feveral mufcles of the face, 

 but only one pair is commonly confidered as properly 

 belonging to it. This, which is called the ccmpreffor 

 naris, arifes externally from the root of the alas nafi, 

 and running obliquely upwards along the cartilage of 

 the nofe, joins its fellow, and is inferted into the neigh- 

 bouring bone. The effect of this mufcle is to comprefs 

 the alse towards the feptum naris, particularly when we 



want 



