Sec 3/Chap7/the sense organs Name Dissecting the eye of a mammal Goal

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1. 
   Observe the exterior of the eye. Note the overall shape.
   
2. 
   use the scissor to cut away the fat and muscles.
   
3. 
   Locate the optic nerve. Note the colour and texture.
   
4. 
   Locate the cornea. Note the colour and shape.
   
5. 
   With the scalpel, make an incision on the edge of the cornea.
   
6. 
   Collect the liquid that seeps out the eye in dissection tray. Note
   the name, colour and texture of the liquid.
   
7. 
   Make an incision with the scalpel into the sclera. With the dissecting scissors, cut the eye into two parts by cutting along the incision.
   
8. 
   Front part of the eye: Use the scissors to cut away the cornea.
   
9. 
   Use the forceps to detach the iris
   
10. 
    Remove the lens. Try to use the lens as a magnifying glass.
    
11. 
    Empty out the gelatinous substance that fills the eyeball, in the dissecting tray.
    
12. 
    With the dissecting forceps, carefully detach the internal membrane at
    the back of the eye. Locate where this structure attached to.
    
13. 
    Spread out the membrane collected in the dissecting tray. Note the name, colour, thickness and texture.
    
14. 
    With the dissecting forceps, carefully detach the second internal
    membrane at the back of the eye. This membrane is called the tapetum Lucidum it is no present in the human eye but is found in the eyes of nocturne animal, cattle etc)
    
15. 
    Locate the optic nerve and make a longitudinal cut along the optic nerve all the way and to the sclera. Locate where the optic nerve is connected to eye.
    
16. 
    Finally tagged all the eyes parts with the provided tags. Call your teacher.
    
17. 
    Clean up and put away all materials as instructed.