1066 



SPECIAL SENSE ORGANS 



transudation from the vessels of the ciliary body and posterior surface of the iris 

 (see also page 1076). The stream passes mainly forward through the pupil into 

 the anterior aqueous chamber, whence it escapes slowly by passing through the 

 spaces of the angle of the iris into the venous sinus of the sclera, and thence into 

 the anterior ciliary veins. Part of the lymph-stream passes from the posterior 

 aqueous chamber backward into the zonular spaces, out of which fluid can pass 

 into the lens substance, or diffuse itself into the front of the vitreous body. 



In the cornea the tymph travels in the spaces already mentioned as existing 

 between the fibre-bundles, and in the nerve-channels and at the periphery of the 

 cornea it flows off into the lymphatic vessels of the conjunctiva. 



In the iris there is a system of lymphatic spaces opening anteriorly into the 

 crypts of the surface, and communicating peripherally with the spaces of the angle 

 of the iris. 



Fig. 808. — ^Lymphatic Spaces of the Eyeball (in green). 



Anterior chamber 



Filtration angl 

 Zonular space 



V. Ciliaris anterior 



Sinus venosus sclerse 

 Corpus ciliare 



Fasda bulbi 



Hyaloid canal 



Space around V. 

 vorticosa 



Spatium interfasciale (Tenoni) 



Supravaginal space 

 Intervaginal space 



2. Posteriorly, we have (a) the hyaloid canal, between the posterior pole of the 

 lens and the optic nerve entrance, and (b) the perivascular canals of the retina; 

 the lymph from both of these situations flows into the spaces of the optic nerve, 

 which communicate with the intervaginal spaces of the nerve, and thus with the 

 great intracranial spaces. Further, between chorioid and sclera we have (c) the 

 perichorioidal space, which gets the lymph from the chorioid, and communicates 

 with the interfascial space (of Tenon) outside the sclera by perforations correspond- 

 ing to the vasa vorticosa and posterior ciliary arteries, and with the intervaginal 

 spaces around the optic nerve entrance. The interfascial space of Tenon, again, 

 is continuous with the supravaginal space around the optic nerve, which communi- 

 cates both with the intervaginal spaces, with the lymi)h-spaces of the orbit, and 

 directly with the intracranial spaces at the apex of the orbit. 



CAVITY OF THE ORBIT 



General Arrangement of its Contents 



The anterior wider half of the cavity is mainly occupied by the eyeball, which 

 lies almost axially, but is rather nearer to the upper and lateral than it is to the 

 other walls. The posterior two-thirds of the globe are in relation with soft parts, 



