304 



MUSCLES OF THE EYE. 



may be taken out adhering to this nerve ; and all having strong 

 fleshy bellies. 



Inserted at the forepart of the globe of the eye into the ante- 

 rior part of the tunica sclerotica, and under the tunica adnata, 

 at opposite sides, which indicates both their names and Use ; so 

 that they scarcely require any farther description than to name 

 them singly. The union of thin tendinous insertions forms the 

 tunica albuginea. 



1. Levator Oculi, (^Rectus Superior,) 



Arises from the upper part of the foramen optlcum of the 

 sphenoid bone, below the levator palpebrse superioris, and runs 

 forwards to be 



Inserted into the superior and forepart of the tunica sclerotica, 

 by a broad thin tendon. 



Use. To raise up the globe of the eye. 



2. Depressor Oculi, {Rectus Inferior,^ 

 Arises from the inferior part of the foramen opticum. 

 Inserted opposite to the former. 



Use. To pull the globe of the eye down. 



3. Adductor Oculi, (Rectus Internus,) 



Fig. 76.* Arises, as the former, be- 



tween the obliquus superior 

 and depressor, being from its 

 situation, the shortest. 



Inserted opposite to the in- 

 ner angle. 



Use. To turn the eye to- 

 wards the nose. 



* The muscles of the eyeball ; the view is taken from the outer sitle of the 

 right orbit. 1. A small fragment of the sphenoid bone around the entrance of 

 the optic nerve into the orbit. 2. The optic nerve. 3. The globe of the eye. 

 4. The levator palpebrae muscle. 5. The superior oblique muscle. 6. Its car- 

 tilaginous pulley. 7. Its reflected tendon. 8. The inferior oblique muscle, the 

 small square knob at its commencement is a piece of its bony origin broken ofl. 

 9. The superior rectus. 10. The internal rectus almost concealed by the optic 

 nerve. 11. Part of the external rectus, showing its two heads of origin. 

 12. The extremity of the external rectus at its insertion ; the intermediate por- 

 tion of the muscle having been removed. 13. The inferior rectus. 14. The 

 tunica albuginea, formed by the expansion of the tendons of the four recti. 



