CHOROID. 



153 



intimate adherence, so strongly as to seem but one. The 

 cornea is thicker than the sclerotic, and is composed of 

 superposed layers perfectly translucent; it is convex in front, 

 and concave behind, and appears to be circular, although its 

 transverse diameter is a little greater than the other. 



Choroid. On the internal surface of the sclerotic is a vas- 



Fig. 34. Vertical section of the eye on the median line. 



A. Cornea. 



B. Anterior chamber. 



C. Pupil. 



D. Iris. 



E. Crystalline. 



F. Zone of 2 'inn, forming the an- 



terior wall of canal of Petit. 



G. Ciliary processes and circle. 

 H. Sclerotic. 



I. Choroid. 

 K. Retina. 

 L. Vitreous body. 

 M. Optic nerve. 

 N. Right inferior imtscle. 

 O. Right srtperior imtscle. 

 P. Leitator muscle of eyelid. 

 Q. Lachrymal glands. 

 R. Lachrymal canal. 



cular membrane called the choroid, which lines it closely 

 from the bottom of the eye to the circumference of the 

 cornea, and is attached to it by a very fine cellular tissue. 

 The choroid is composed of two layers, of which the external 

 corresponds to the sclerotic, and the internal, or membrane 



