932 



HUMAN ANATOMY. 



category of lymph-spaces, and among these there may be mentioned the subarachnoid 

 and subdural spaces of the meninges, Tenon's space in the orbit, and even the 



Fig. 781. 



Valve 



Perivascular 



lymph-space 



Lymph-space 



Lymph-vessel 



Deeply stained 

 ground substance 



M 





'/^! 



Portion of central tendon of rabbit's diaphragm, treated with silver nitrate ; lymphatic vessels are shown as light 

 irregular tracts ; lymph-spaces are seen within stained ground substance. X 120. 



spaces occupied by the aqueous and vitreous humors of the eye, as well as the 

 smaller spaces of that organ. So, too, the spaces surrounding that enclosed by the 



membranous labyrinth of 

 Fig. 782. the ear have been regarded 



as lymph-spaces, as is 

 indicated by their names. 

 Finally, it may be 

 mentioned that the syn- 

 ovial cavities of the artic- 

 ulations and the greater 

 serous cavities of the body 

 enclosed by the pleura, 

 pericardium, and perito- 

 neum have been regarded 

 as being in direct com- 

 munication with the lym- 

 phatic capillaries ; but this 

 view is also in all proba- 

 bility erroneous. 



Notwithstanding the 

 independence of these 

 spaces from the lymphatic 

 capillaries, it must be 

 recognized that some of 

 them at least play im- 

 portant roles from the 

 physiological standpoint, 

 in serving as middle-men between the tissues and the lymphatics, and, furthermore, 

 those of the eyeball, by their communication with neighboring spaces, permit of a 



Blood-vessel— 



S\ 



Lymph- 



^v: 



space .. 



\i 



■■' ! 



f 



x~ 



v> 



Perivascular lymph-spaces surroutnliri>; retinal blood-vessels. X 230. 



