720 



THE EYE. 



tinuous with the pigmentary layer lining the choroid and the ciliary pro- 

 cesses, and consists of several strata of small roundish cells filled with dark 

 pigment. The colour of the iris depends on the pigment ; in the different 

 shades of blue eye it arises from the black pigment of the posterior surface 

 appearing more or less through the texture, which is only slightly coloured 

 or is colourless ; and in the black, brown, and grey eye, the colour is due 

 to the pigment scattered through the iris substance. 



Fig. 466. 



Fig. 466. SECTIONAL VIEW OP THE CONNECTIONS OF THE CORNEA, SCLEROTIC, IRIS, 

 CILIARY MUSCLE, CILIARY PROCESSES, HYALOID MEMBRANE AND LENS, f 



The specimen extends from the middle of the lens to the ora serrata on the inner side 

 of the right eye. C, the laminated cornea; cc, conjunctiva corneae ; cs, conjunctiva 

 scleroticse ; ce, epithelium of the conjunctiva ; ela, anterior elastic layer of the cornea 

 passing outwards in part into the conjunctiva; elp, posterior elastic layer; U, liga- 

 mentum pectinatum iridis, elastic ligament, spreading into the base of the iris, the 

 sclerotic, and the attachment of the radiated ciliary muscle ; S, the sclerotic at its 

 thinnest part ; A, the anterior aqueous chamber ; ap, the recess forming the posterior 

 division of the aqueous chamber ; sv, placed at the junction of the cornea and sclerotic, 

 points to the circular venous sinus or canal of Schlemin ; ea, epithelium behind the 

 cornea indicated by a dotted line ; ei, epithelium in front of the iris similarly indicated ; 

 ir, radiating muscle of the iris ; io, divided fibres of the orbicular muscle ; u, pigment 

 layer or uvea ; In, centre of the crystalline lens ; Ic, capsule of the lens ; Ice, layer of 

 cells in front of the lens ; cir, radiating ciliary muscle or tensor choroidese ; do, divided 

 orbicular fibres ; dp, ciliary process, along the inner border of which a layer of pigment 

 is continued from the choroid to the uvea, excepting at the end of the process ; Ch, 

 choroid membrane ; R, the retina close to the ora serrata ; re, the ciliary part of the 

 retina, the structure of which is imperfectly represented ; V, the vitreous humour ; k, 

 the hyaloid membrane ; P, canal of Petit ; k', the hyaloid membrane continued behind 

 the canal to the capsule of the lens ; Z, zonule of Zinn, and II, suspensory ligament of 

 the lens proceeding from the hyaloid covering the ciliary process to the front of the capsule 

 of the lens. 



