EYE 75 



dorsal margin of the optic foramen and is inserted 

 on the dorsal surface of the eyeball. 



12. The Superior Oblique Muscle arises from the 

 margin of the optic foramen. Nearly opposite 

 the middle of the eyeball it becomes tendinous, 

 and passes through a fibro-cartilaginous ring, situ- 

 ated on the inner dorsal side of the orbit ; it then 

 passes toward the eyeball and is inserted on the 

 dorsal side, at right angles to the insertion of the 

 superior rectus muscle. 



1 3. The Choanoid Muscles arise around the optic 

 foramen and are inserted on the circumference of 

 the eyeball, within the insertion of the recti mus- 

 cles. 



EYEBALL. 



Remove the eyeball from the orbit by ciitting 

 through the muscles and optic nerve. Dis- 

 sect off the fat and other tissiies adhering to 

 its surface. 



1. The Sclerotic Coat is the white, opaque portion 

 of the external coat of the eye. It is pierced by 

 the optic nerve, near the middle point of its poste- 

 rior surface. The sclerotic coat is composed of 

 smooth, white, fibrous tissue, and gives solidity to 

 the eyeball. 



2. The Cornea is the transparent anterior portion 

 of the external coat. Its outer surface is covered 

 by the conjunctiva. 



