SENSE OF SIGHT. 



547 



Ciliary Body. In this term are included the ciliary muscle 

 and the ciliary processes. 



Retina. This is the most internal of the tunics of the eye, 



FIG. 326. The normal eye-ground as seen with the ophthalmoscope : TO, optic nerve- 

 head ; w, macula ; a, retinal artery ; v, retinal vein (Pyle). 



and is divided into two parts : (1 ) Pars optica retince, which 

 extends as far forward as the ciliary body, where it ends in an 



Fovea centralis. 



Layer of 



nerve-fibers, j 

 Gangliou-cell- 

 layer. 



Inner molecu- 

 lar layer. 

 Inner nuclear < i 



layer. 



Outer molecu- "j 

 lar layer. 

 Outer fibrous - 

 layer. 



Outer nuclear fl 

 layer. 



Cones. - 





FIG. 327. Section through human macula lutea and fovea centralis ; X 150. As 

 a result of treatment with certain reagents, the fovea centralis is deeper and the 

 margin more precipitous than during life (Bohm and Davidoff). 



irregular margin, ora serrata ; (2) pars ciliaris retince, composed 

 of the fibrous stroma of the retina with the pigment-layer, with- 



