346 NERVES OF THE EYE-BALL. 



SUMMARY OF BLOOD VESSELS AND NERVES OF THE BALL OF THE EYE. 



The ophthalmic artery sends off the ciliary branches which 

 are divided into the short and long. The short are from 10 

 to 20 in number, they surround the optic nerve, penetrate the 

 sclerotic coat behind, and are distributed upon the choroid, 

 some of the branches going as far forward as the iris and 

 ciliary processes. The long ciliary are two in number, one 

 on either side of the eye, which pass to the ciliary ligament 

 and iris, while the arteria centralis, penetrating the optic 

 nerve and passing through its centre, supplies the retina, 

 vitreous humor, and crystalline lens. 



FIG. 101. 



The nerves of the eye-lall (Fig. 101) come from the oph- 

 thalmic ganglion. This ganglion, called also lenticular and 

 ciliary, is situated in the posterior part of the orbit, between 

 the rectus externus muscle, and optic nerve. It is imbed- 

 ded in adipose structure, and presents a reddish aspect. It 

 is described as having four angles, the posterior superior 



FIG. 101 represents the Nerves of the Eye-ball, a Optic nerve, b Trunk 

 of the motor oculi. c Inferior branch of this latter nerve, d Ganglion of 

 Gasser. e Ophthalmic or first branch of the fifth. / Nasal branch of the 

 ophthalmic, g Superior maxillary or second division of the fifth, h Inferior 

 maxillary or third division of the fifth, i Posterior coat of the sclerotica, 

 where the ciliary nerves enter, j Choroid coat, k Front portion of the 

 sclerotica. I Lower segment of the cornea, m Ciliary ligament, n Iris, o 

 Pupil, p Sensitive root of the ophthalmic ganglion, q Corresponding motor 

 branch of this sensitive root, r Sympathetic filament, s Ophthalmic ganglion. 

 t Long ciliary nerves. M Anastomosis between the short ciliary nerve and 

 nasal branch, v Ciliary nerves from ophthalmic ganglion, w Ciliary nerves 

 anastomosing with each other, x Motor branches of the same nerves y Ciliary 

 nerves that penetrate the sclerotica, and supply the conjunctiva. 



