180 SPECIAL PHYSIOLOGY 



(a) Make a drawing of the choroid with its iridal and ciliary 

 portions thus exposed. 



(6) Locate, if possible, the course and distribution of nerves and 

 bloodvessels. 



(4) With fine forceps grasp the margin of the iris and with fine 

 scissors cut out a sector limited posteriorly by the ciliary body. 



(a) Study the boundaries of the posterior chamber. 



(b) Find fibres of the suspensory ligament. 



(c) Describe the anterior surface of the ciliary processes. 



(5) Make a circular incision with small scissors severing the 

 choroid and retina at about the line of the ora serrata. Lift off from 

 the dense vitreous humor the whole ciliary apparatus and lens; 

 place them, anterior surface downward, upon a plate. 



(a) Describe the posterior aspect of the ciliary processes. 



(6) Describe the lens minutely, as viewed externally. 



(c) Make a section of the lens; describe its appearance. Is the 

 capsule discernible? 



(6) Describe the retina as seen through the vitreous humor. 



(a) Locate the entrance of the optic nerve. 



(b) Can the fovea centralis be located? 

 2. Posterior Dissection. 



(7) Let one member of the division remove the posterior half of 

 the sclerotic coat, after fixing the eye with cornea downward, using 

 the recti muscles, in this case also, for guys. 



(a) Note the vence vorticosce. 



(b) Follow the ciliary nerves from their entrance into the eyeball, 

 along their course between the sclerotic and choroid coats. 



(c) Do you find the long ciliary arteries, or the posterior ciliary 

 arteries ? 



(8) Remove the choroid carefully. 



(a) Note the character of its tissue, its vascularity, and its rich 

 pigmentation. 



(6) Describe the retina as seen from this direction. Its pigmented 

 layer has probably come away with the choroid. 



(9) Remove the posterior half of the vitreous body together with 

 the retina. 



Make a drawing of the posterior surface of the lens, suspensory 

 ligaments, and ciliary processes as shown posteriorly. 



(10) Remove the remnant of the vitreous body; sever the fibres 

 of the suspensory ligament; lift out the lens. 



Describe the ciliary body and the iris thus held in their normal 

 relations by the supporting sclera. 



