CILIARY BODY 539 



the corona ciliaris will be seen. It is covered with ciliary pro- 

 cesses which radiate backwards from the circumference of the 

 crystalline lens. Wash out the pigment from the anterior part 

 of the vascular tunic, in order to display the arrangement of the 

 processes more fully. 



A second dissection may be made, in another eyeball, with 

 the object of exposing the ciliary processes from the front. In 

 that case remove the cornea by cutting round the corneo-scleral 

 junction with the scissors. The iris is then brought conspicu- 

 ously into view, and may, with advantage, be studied at this 

 stage. Several cuts in the meridional direction, and at equal 

 intervals from each other, should, in the next place, be made 



Ligamentum pectinatum iriclis and spatia anguli iridis 



Scleral spur I .. , . .... 



Venous sinus of sclera ' Ra . dial mUSC r le . of ins 



Sclera 



Iris 



Meridional fibres of ciliary muscle 



Parts of ciliary processes 

 India! angle Circular fibres of ciliary muscle 



FIG. 302. Section of Iridial Angle. (Prof. Arthur Thomson.) 



through the anterior part of the sclera. The specimen should 

 then be placed in a cork-lined tray, filled with water, and the 

 strips of sclera should be separated from the ciliary muscle, bent 

 aside and pinned to the cork. The last step in the dissection 

 consists in the removal of the iris. 



The corona ciliaris lies on the posterior aspect of the 

 orbiculus ciliaris and is continuous, anteriorly, with the iris, 

 and, posteriorly, with the chorioid. It consists of a number 

 of larger folds, called \\\e processus ciliares, 70 to 72 in number, 

 which are intermingled with a number of smaller folds, called 

 the plica ciliares. The ciliary processes extend from the 

 anterior margin of the chorioid to the anterior margin of the 



