C M 1 
xvm. 
The Orbicularis * arifes tendinous and flefhy from 
the Edge of the Os maxillare> that makes the lower 
Part of the Orbit at the inner Angle of the Eye. Its 
Fibres are fp.read upon the under Lid, and a great 
Part of the Os Mali , and, running round the little 
Canthus , they are continued, Authors fay, over the 
upper Lid, and upper Part of the Orbit at the great 
Angle adhering to Part of the Os Frontis , and fupe* 
rior Procefs of the Os maxillare . This Mufcle, 
fay they, draws the two ciliary Edges together, and 
fhuts up the Eye. 
XIX. 
Observation. 
It is no difficult Matter to conceive how the Eye- 
lid is opened - y becaufe there is a fixed Point to which 
it is drawn back by the Contraction of the Aperiens 
Palpebram : For, altho’ the Origination of this Muf- 
cle is rather behind the Eye than above it, as being 
at the Bottom of the Orbit, yet the End of pulling 
up the Lid is anfwefd, fince the Ball of the Eye 
ferves its tendinous Expanfion as a Lever or Pulley > 
whilft the flefhy Fibres behind are contracted, to fa- 
vour its Afcent, as well as if its Origination was in a 
right 
* Moft Authors, and particularly Covjper and Douglas , make this 
Mufcle but one circular Mufcle ; but Spigel. and Riolan, divide it 
into two. the upper and under, and give them Attachments at either 
Angle of the Orbit, to which Diemerbroeck fubferibes. 
