1768 



HANDLil K IK OF l'HYMi 'I I l(;V 



Ml R( il'HYSIl '1 ■II.', Ill 



fig. R. Plexuses of the anterior 

 segment of the eye. ' . conjum - 



lival plexus. /. I ' -nun's capsule 

 plexus, l'l.c, episcleral plexus, 

 PLi, intrascleral plexus, Mc, cili- 

 ary muscle; VMc, vein of ciliary 

 muscle, A, a, anterior ciliary ar- 

 tery; Win, anterior ciliary vein, 

 PrC, ciliary process, ( „. collector; 

 L, limbers. [From Maggiore 

 149) 



veins, it is unlikely that the iris is a site for any sig- 

 nificant absorption of fluid;'' as an auxiliary site for 

 the formation of the fluid, the iris cannot be entirely 

 ruled out, while, as we sh.ill see, as a region in which 

 rapid exchanges of dissolved material between blood 

 and aqueous humor take place it may occupy a 

 prominent position. 



clear, however, that the fluids are not simple plasma 

 filtrates when we compare the ratios of the concentra- 

 tion in fluid and the concentration in plasma with 

 those found experimentally for plasma dialysates 

 (table i ). Thus, to choose some of the more obvious 

 discrepancies, it will be seen that the cerebrospinal 

 fluid has higher concentrations of sodium and chloride 

 than are found in a plasma dialysate, while the con- 



CHIiMH :.\l COMPOSITION OF INTRACRANIA] 

 AND rNTRAOCULAR FLUIDS 



Both the aqueous humor and cerebrospinal fluid 

 differ from plasma in one obvious respect, namely in 

 their very low concentrations of protein; thus the ap- 

 proximate protein concentrations in man and the 



rabbit ' are .is follows: 



i lerebrospioal Fluid 



Man 2 , hi'.' pei loo ml 



Rabbit 25 mg per 100 ml 



Aqueous Humor 



1 ;( nn per IO0 nil 

 (l mg per [00 ml 



H\ contrast, there are some 65 7500 mg of pro- 

 tein per too ml in the plasma. It immediately becomes 



II,. vortex veins drain .ill the bl 1 from the iris, while 



Schlen anal empties, ultimately, into the anterior ciliary 



'.ems 



11, , linal Muni from the rabbit was obviously .1 



mixed sample ol ventriculai and subarachnoid Hinds sine. 



about 1 ml was drawn from the cisterna magna f"he B 



q ed for the protein concentration in human cerebrospinal 



fluid , 186) applies to lumbal Fluid; ventricular fluid has a lowei 

 concenti ation 1 ; 



1 11. <>. Photograph ol an aqueous \em >i, pure aqueous vein; 

 /,, blood vein;;, laminated vein [From Weinstein <-•( , . 





