TECHNIQUE OF EYE DISSECTIONS 



move the whole half from the water ; tilting it 

 slowly to empty it of all the water, and, having 

 done so, turn it idown upon the table rather 

 forcibly in order to help it drain itself of all 

 the water. 



Notice the thinness of the retina, and, also, 

 that the seeming iridescence of the choroid 

 shows through. The optic disc, which is the 

 point of entrance of the optic nerve, and the 

 optic cup are easily recognized, though neither 

 will be seen us large as when viewed in the 

 living eye with an ophthalmoscope. The 

 blood vessels of the retina, as they ramify 

 outward or forward, after their entrance 

 through the optic nerve through which they 

 pass, are also very plainly seen. A closer 

 inspection will show, in the very centre of 

 the " entrance " of the optic nerve, a whitish, 

 pointed vessel, about 1 or 2 mm. long. 

 That is the sloughed-off and atrophied end 

 of the hyaloid artery, which, when the eye 

 was in an embryonic state, ran forward from 

 the central artery of the retina through the 

 hyaloid canal to the posterior surface of the 



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