DISSECTION OF THE EVE. 93 
8. The Choroid Coat. After removing the retina a 
good view will be obtained of the choroid. This coat 
can also be torn off with but little difficulty from the 
sclerotic, except at the entrance of the optic nerve. 
Notice the difference in thickness between the two 
coats. 
Pili ANTERIOR HALF. 
Looking into the anterior half, the crystalline lens 
will be seen through the vitreous humor, and through 
it the iris and pupil. 
9. The Ciliary Processes of the Choroid.  Sur- 
rounding the lens the anterior portion of the choroid 
coat is thrown into a number of radiating folds, the 
ciliary processes. 
10. Ora Serrata of the Retina. The retinal coat 
ends round the periphery of the ciliary processes. The 
line of demarcation seems quite sharp, but if ex- 
amined more closely with a lens it will be found to be 
wavy. This indented margin of the retina is the 
ora serrata. In reality there is a delicate membrane, 
continuous with the retina, extending forward from 
the ora serrata to the tips of the ciliary processes, 
known as the ‘pars ciliaris retinz,” which is em- 
bryologically a part of the retina but does not have 
the true retinal structure. | 
II. The Crystalline Lens. Remove as much as 
possible of the vitreous humor without disturbing the 
lens ; then with the point of the scissors raise the 
periphery of the lens from the ciliary processes: the 
delicate membrane passing from one to the other is 
the suspensory ligament of the lens. Remove the 
lens entirely and notice its shape. The posterior sur- 
face is much more convex than the anterior surface. 
