724 



THE EYE. 



The nerves for the supply of the iris are named ciliary : they are nume- 

 rous and large ; and, before entering the iris, divide in the substance of the 

 ciliary muscle. 



Fig. 470. 



Fig. 471. 



Fig. 470. VESSELS OP THE CHOROID, CILIARY PROCESSES AND IRIS OF A CHILD (from 

 Kolliker after Arnold). >-<> 



a, capillary network of the posterior segment of the choroid ending at , the ora 

 serrata ; c, arteries of the corona ciliaris, supplying the ciliary processes d, and passing 

 into the iris e ; f, the capillary network close to the pupillary margin of the iris. 



Fig. 471. FRONT VIEW OF THE BLOODVESSELS OF THE CHOROID COAT AND IRIS FROM 

 BEFORE (from Arnold). !_ 



A, interior part of the choroid : B, iris ; C, ciliary muscle, &c. ; 1, 1, long posterior 

 ciliary arteries ; 2, five of the anterior ciliary arteries ramifying towards the outer margin 

 of the iris ; 3, loop of communication between one of the anterior and one of the long 

 posterior ciliary arteries ; 4, internal circle and network of the vessels of the iris ; 5, 

 external radial network of vessels. 



Fig. 472. Fig. 472. LATERAL VIEW OF THE CILIARY 



NERVES (from Arnold). 



a, optic nerve ; b, hack part of the sclerotic ; 

 c, ciliary muscle, &c. ; d, iris ; e, outer surface 

 of the choroid coat; 1, five of the ciliary nerves 

 passing along the sheath of the optic nerve, 

 piercing the sclerotic posteriorly, and thence 

 passing forward on the choroid membrane to 

 the ciliary muscle and iris. The nerves are 

 represented too large. 



The ciliary nerves, about fifteen in num- 

 ber, and derived from the lenticular ganglion 



and the nasal branch of the ophthalmic division of the fifth nerve, pierce the 

 sclerotic near the entrance of the optic nerve, and come immediately into contact with 



