. The anatomy of the domestic animals . Veterinary anatomy. Fig, 697.—Inner Surface of Anterior Part of Eyeball of Horse (Equatorial .Sbctionj. i, Sclera; 2, chorioidea; 5, retina {drawn away from chorioidea); 4i ciliary processes; 5, crystalline lens, through which the pupil {6) is seen. (After Ellenberger, in Leisering's Atlas.) Fig. 698.—Fundus Oculi, Seen on Equatorial Sec- tion OF Eyeball of Horse. 1, Sclera; 2, chorioidea; 3, retina (loosened); 4, tapetum; 5, optic papilla; 6, optic nerve. (After Ellenberger, in Leisering's Atlas.) can be stripped off the chorioid, leaving most of its ou
. The anatomy of the domestic animals . Veterinary anatomy. Fig, 697.—Inner Surface of Anterior Part of Eyeball of Horse (Equatorial .Sbctionj. i, Sclera; 2, chorioidea; 5, retina {drawn away from chorioidea); 4i ciliary processes; 5, crystalline lens, through which the pupil {6) is seen. (After Ellenberger, in Leisering's Atlas.) Fig. 698.—Fundus Oculi, Seen on Equatorial Sec- tion OF Eyeball of Horse. 1, Sclera; 2, chorioidea; 3, retina (loosened); 4, tapetum; 5, optic papilla; 6, optic nerve. (After Ellenberger, in Leisering's Atlas.) can be stripped off the chorioid, leaving most of its outer pigmented layer on the latter. During life it is transparent, except as to its pigmented epithelium, and the reddish appearance of the fundus as viewed by the ophthalmoscope is caused by the blood in the network of the choriocapillaris. The entrance of the optic nerve forms a sharply defined, oval, light area, the optic papilla (Papilla nervi optici), situated about 15 mm. ventral to the horizontal meridian and 3 to 4 mm. lateral to the vertical meridian. The central part of the papilla is slightly depressed (Excavatio papillae n. optici). The transverse diameter of the papilla ia about 6 to 7 mm., and the vertical about 4 to 5 mm. It is commonly situated a little below the margin of the tapetum, but the latter may extend down somewhat on either side of the papilla. The lower margin is often indented a little. In inspec- tion of the fundus mth the ophthalmoscope numerous fine branches of the arteria centralis retinae are seen radiating from the periphery of the papilla. The optic nerve fibers converge from all parts of the pars optica to the papilla, where they collect into bundles which traverse the lamina cribrosa of the chorioidea and sclera, and constitute the optic nerve. The area centralis retinae is a round spot, 2 to 3 mm. in diameter, situated dorso-lateral to the optic papilla; it corre- 1 In man the line is finely serrated and is termed the ora Plea
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