604 



THE EYE. 



The anferior ciliary arferies (H^. 4M, 2, 2), five or six in number, but 

 smaller than the vessels just described, are supplied from the muscular 

 and lachrymal branches of the ophthalmic artery, and pierce the sclerotic 

 about a line behind the margin of the cornea ; they divide into branches 

 which supply the ciliary processes, and join the circulus major. 



Besides these special arteries, numerous minute vessels enter the iris 

 from the ciliary processes. 



The veins of the iris follow closely the arrangement of the arteries 

 just described. The canal of Schlenim communicates with this system 

 of vessels. 



Fis. 41 n. 



Ficr. 414. 



Fig. 413. — Vessels op the Ciiouoit), Ciliary Processes and Iris op a Child 

 (Arnold). Magnified 10 times. 



a, capillary network of the posterior part of the choroid ending at h, the ora serrata ; 

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

 iris c ; /, the capillary network close to the pupillary margin of the iris. 



Fig. 414. — Front View of the Blood-vessels op the Choroid Coat and Iris froji 

 BEFORE (Arnold). Magnified 2h times 



A, choroid : B, iris ; c, ciliary muscle, &c. ; 1, 1, long ciliai-y arteries ; 2, 2, five of fke 

 anterior ciliary arteries ramifying at the outer margin of the iris ; 3, loop of communica- 

 tion between one of the anterior and one of the long ciliary arteries ; 4, internal circle 

 and network of the vessels of the iris ; 5, external radial network of vessels. 



The ciliari/ nerves (fig. 415, 1), about fifteen in number, 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 the choroid. They 

 are somewhat flattened in form, are partly imbedded in grooves on the 

 inner surface of the sclerotic, and communicate occasionally with each 

 other before supplying the cornea and entering the ciliary muscle. 

 "When the sclerotic is carefully separated from the subjacent structures, 



