581 SIGHT. 



Left eye, seen outside, the outer part of the orbit having been removed. 







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1,1. Portion of the upper part of the orbit belonging to the frontal bone. 



2. Section passing through the malar bone and the malar process of the supe- 

 rior maxillary. 



3. Globe. 



4. External rectus muscle. 



5. One of its two posterior insertions, running to the small wing of the sphenoid. 



6. The other of these insertions, running inwards to the cavernous grove. 



7. Inferior rectus. 



8. Its posterior insertion. 



9. Superior rectus. 



10. Its posterior insertion in the small win*; of the sphenoid. 



11. Superior oblique. 



12. Its reflected tendon. 



13. Inferior oblique. 



14. Internal rectus. 



15. Levator palpebrae superioris. 



16. Its posterior insertion. 



17. Optic nerve. 



18. Part of the sphenoid. 



The motions of the eyes which result from the actions of these 

 muscles were investigated, and the mental perceptions attending 

 them analysed, with considerable success, by Dr. Wells. Sir 

 Charles Bell long afterwards took up the subject, and published 

 some opinions which appear to me altogether groundless. c He 

 fancies that the pair of pathetic or internal motor nerves belong to 



c Phil, Tram. 1823. 



