94 DISSECLION OF FHA EVE, 
Divide this portion of the eye into a right and a 
left half by a cut along the vertical meredian. 
12. Junction of the Choroid and Iris. Along the cut 
edge of one of these halves notice the relations of the 
choroid, ciliary processes, and iris. The iris is direct- 
ly continuous with the choroid, and along the line of 
junction of the two the part of the choroid coat known 
as the ciliary processes is partly free, projecting some- 
what toward the interior of the eye. 
13. The Canal of Schlemm. [Find the point of 
junction of choroid and iris. Between this and the 
sclerotic where it joins the cornea is a rather con- 
spicuous canal running circularly round the eyeball. 
Insert a bristle and follow its course. 
14. The Ciliary Muscle. At the posterior margin 
of the canal of Schlemm the choroid coat is firmly 
attached to the sclerotic by an oblique band of whit- 
ish fibres, the radial fibres of the ciliary muscle. 
These fibres belong to the class of involuntary muscle- 
fibres. When they contract they pull forward the 
choroid coat and slacken the suspensory ligament, al- 
lowing the lens to become more convex. 
For the following dissection a fresh eye should be 
used. Do not clean off the muscles, etc., but fasten the 
eye to the beeswax by the ard of pins so that the cornea 
faces directly upwards and prozects somewhat above 
the level of the water in the pan. 
15. The Aqueous Humor and Anterior Chamber. 
Cut through the cornea at its junction with the scle- 
rotic, and dissect it off completely. The liquid that 
escapes is the aqueous humor. It fills up the space 
between the cornea and the iris known as the anterior 
chamber of the eye. 
