600 



THE EYE. 



Fig. 409. 



Tvith fine oifsets, which intercommunicate and form a network or stroma 

 (fig. 409). Towards the inner part of the tunic, this network passes 

 gradually into a web without pigment. Externally the choroid is 



bounded by a membranous layer similar 

 to the lamina fusca of the sclerotic, and 

 known as the lamina siqjra-cJwroiclea 

 (fig. 403, d). It is loosely united to the 

 lamina fusca by vessels and bands of 

 connective tissue enclosing pigment-cells, 

 and the enclosing laminas as well as the 

 uniting structures are coated with epithe- 

 lioid cells, a lymph space being thus 

 formed between the sclerotic and choroid. 

 This space communicates with that of the 

 capsule of Tenon before described (p. 589) 

 (Schwalbe). 



The inner part of the choroid coat 

 {tunica Ruysckiana s. chorio-capiUaris) is 

 formed mainly by the capillaries of the 

 choroidal vessels. From the ends of the 

 arteries the capillaries radiate, and form meshes which are more deli- 

 cate and smaller than in any other texture, being especially fine at 



Fig. 409. — Ramified Pigment 

 Cells of the Choroid (Kol- 

 liker). 300 Diameters. 



Fis. 410. 



Fig. 410.— Injected Blood-vessels of thij Chohuid Coat (from Sappey). 

 30 Diameters. 



1, one of the larger veins ; 2, small communicating vessels ; 3, brauclies dividing into 

 tlie smallest vessels. 



the back of the eyeball (fig. 410). The network reaches as far forwards 

 as about -Hh of an inch from the cornea, or opposite the end of the 



