THE EYE. 



419 



Pigment cells are also present. The lamina vascu- 

 losa is the broadest layer and is also composed of 

 areolar tissue. The blood-vessels constitute its 

 principal portion, and they are so distributed that the 

 larger ones, the veins, occupy its outer portions. 

 The lamina choriocapillaris consists chiefly of capil- 



Lens. 



Cornea 



Canal of Petit. 



Canal o] Schkmm 



Ciliary muscle. 



Conjunctiva. 



Fig. 290. Section through the ciliary body. 



lary vessels that are particularly abundant in the 

 region of the macula lutea, or yellow spot of the 

 retina. In other respects this layer resembles the 

 lamina suprachoroidea, except that pigment cells 

 are absent. The glassy or -vitreous membrane is but 

 2 p thick, homogeneous, clothes the inner choroid 



