Lab: A Sheep’s Eye Purpose: To explore the anatomy of the eye.

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Presentation transcript:

Lab: A Sheep’s Eye Purpose: To explore the anatomy of the eye. Materials: Dissecting Trays Scissors Sheep’s Eye News Paper Scalpel Gloves Procedure: Prior to making any incisions(cuts), examine the outside layer of the sheep eye. Identify the following parts: The cornea, iris, pupil, and the optic nerve. Cut the eye in half, between front and back of eye. Be careful when you cut so that you do not destroy the pupil and lens. clear jelly like fluid will be inside the eye. Observe the back half of the eye. Can you see the optic nerve? Attached to the optic nerve is a wrinkled saclike structure connected to the back of the eye. This is the retina . Separate the retina from the back portion of the eye and observe. Now observe the front half of the eye. In the front of the eye, or mixed with the vitreous humor will be a small lens. Dry it with a piece of paper towel. Feel and feel how flexible it is. Hold above your eye, how does it change your vision? Place onto a piece of news paper. Try to locate the lens muscles along the inner side of the iris. Take out the pupil which is surrounded by the iris is on the front of the eye. The cornea will be the transparent part of the front of the eye.

Analysis: Is the retina smooth or wrinkled? Why would it be this way? Why is the lens flexible? What happens to the print on the newspaper? Why does the iris and pupil dilate?

Lab: A Sheep’s Eye Procedure: Prior to making any incisions(cuts), examine the outside layer of the sheep eye. Identify the following parts: The cornea, iris, pupil, and the optic nerve.

Lab: A Sheep’s Eye 2. Cut the eye in half, between front and back of eye. Be careful when you cut so that you do not destroy the pupil and lens. clear jelly like fluid will be inside the eye.

Lab: A Sheep’s Eye Observe the back half of the eye. Can you see the optic nerve? Attached to the optic nerve is a wrinkled saclike structure connected to the back of the eye. This is the retina . Separate the retina from the back portion of the eye and observe.

Lab: A Sheep’s Eye 5. Now observe the front half of the eye. In the front of the eye, or mixed with the vitreous humor will be a small lens. 6. Dry it with a piece of paper towel. Feel and feel how flexible it is. Hold above your eye, how does it change your vision? Place onto a piece of news paper.

Lab: A Sheep’s Eye 7. Try to locate the lens muscles along the inner side of the iris. 8. Take out the pupil which is surrounded by the iris is on the front of the eye. 9. The cornea will be the transparent part of the front of the eye.

Lab: A Sheep’s Eye Analysis: Is the retina smooth or wrinkled? Why would it be this way? Why is the lens flexible? What happens to the print on the newspaper? Why does the iris and pupil dilate?