Q2 DISSECTION OF THE EYE. 
3. The Choroid Coat lying under the sclerotic is 
much thinner and very darkly pigmented. Beneath 
the line of junction of the sclerotic and cornea the 
choroid passes into the iris. 
Pinch up a bit of the choroid with the forceps and 
sutp it off with scessors. From this opening pull or 
dissect off the choroid from the whitish underlyng 
retina. 
4. The Retina will be exposed asa delicate opaque 
membrane lying upon the vitreous humor. 
5. The Vitreous Humor. Pull off the retina with 
a pair of forceps. The vitreous humor will be seen as 
a transparent gelatinous mass filling up the cavity of 
the eyeball. It is enclosed in a delicate membrane, 
the hyalocd membrane. Through the window thus 
made the interior of the eyeball can be seen. 
To get a better view of the interior cut through the 
eyeball in the equatorial plane with a parr of scissors, 
dividing tt into an anterior and a posterior half. 
POSTERIOR el Ade. 
6. The Retina. Notice the way in which the retina 
curls away from the choroid. One of the layers of 
the retina, the pigmentary epithelium, is left in con- 
nection with the choroid. 
7. The Optic Disc. The point of entrance of the 
optic nerve is seen as a small white oval area, com- 
posed of the nerve-fibres of the optic nerve, and-not 
having the structure of the retinal membrane. It is 
the blind spot of the eye. The blood-vessels of the 
‘retina enter through the optic nerve and can be seen 
radiating from the middle of the optic disc. The 
retina can be torn off easily with forceps as far as the 
optic disc, where it is firmly attached. 
