THE EYE 



«527 



Refracting Media. 



Aqaeons Humour and Chambers of the Eye. — The aqueous humour 

 occupies the space between the cornea and the front of the crystalline 

 lens, which is divided by the iris into two chambers, anterior and 

 posterior. It is a clear fluid, having an alkaline reaction, and is 

 composed of H.2O, holding in solution a very small amount of sodium 

 chloride. 



The anterior chamber is bounded anteriorly by the cornea, and 

 posteriorly by the iris and the central portion of the crystalline 



Levator Palpebne Superioris 



Hyaloid Canal 

 (Canal of Stilling) 



Canal of Schlemm 



Hyaloid Membrane 



Retina 



Choroid 



Rectus Saperior 



.Sclerotic 



Ciliary / 

 Processes' 



Canal of Petit 



Inferior 



Fornix Conjnnctivae 

 Fig. 639. — Vertical Sagittal Section of the Eye and its 



.\PPENDAGES (HiRSCHFELD AND LeVEILL£). 



lens, enclosed within its capsule. The anterior chamber com- 

 municates with the spaces of Fontana, through them with the 

 canal of Schlenun, and through this canal with the veins of the 

 sclerotic. 



The posterior chamber, which is of limited extent, is bounded 

 anteriorly by the iris, and posteriorly by the peripheral part of the 

 crystalline lens and its suspensory ligament, and by the ciliary 

 processes. The anterior and posterior chambers communicate with 

 each other through the pupil ; with lymph-spaces in the iris ; and, 

 through the latter spaces, with the perichoroidal lymph-space. 



