Cow Eyeball Dissection

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• After completing the dissection,  What parts did you find?  Hold up the lens carefully and look through it!  Can you see anything?  Do you notice anything ‘special’ about the objects you see through the lens?  What was the most interesting thing you found?  What impressed you the most during your dissection?  Is there anything else you saw or want to discuss?

3 pics REQUIRED, must be original. 

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View the Dissection Discussion Rubric Download Dissection Discussion Rubric 

Pictures required.

– Hold up the organ with your face in the picture.  

– Show me the lens and vitreous humor within the eye’s chambers after you have sliced this open.

– Pick another good picture to share with the class.

Some picture files are large,I can only open png, jpg, and pdf files.  Do not attach any other file in different formats.

#1  Obtain a preserved cow or sheep eye, dissecting scissors, and a dissecting tray (could be aluminum foil or cookie tray).  Wear disposable gloves.  If you have latex allergies, make sure you use non-latex gloves.

#2  Examine the external surface of the eye, observing the thick cushion of fatty tissue.  Identify the following structures and describe them:-extrinsic muscle-optic nerve-adipose layer-cornea-sclera-ciliary body-lens-iris-aqueous and vitreous humor-retina-optic disc-conjunctiva

#3  Describe your experience and observations with the class. Explain what parts you identified and their functions.  Students may not work in groups and the pictures you submit must be your own. 

#4 Add at least 3 pictures.  A good cell phone picture will do if that is all you have.

Sample Solution

During the cow eyeball dissection, you will observe and identify various structures of the eye. Here is a brief description of some of the structures you will encounter:

• Extrinsic muscles: These are the muscles that control the movement of the eye.
• Optic nerve: It is responsible for transmitting visual information from the eye to the brain.
• Adipose layer: It is a thick cushion of fatty tissue surrounding the eye, providing protection and insulation.
• Cornea: It is the transparent outer layer of the eye that helps to focus incoming light.
• Sclera: It is the tough, white outer covering of the eye, providing structural support.
• Ciliary body: It produces the aqueous humor and helps to control the shape of the lens for focusing.
• Lens: It is a clear, flexible structure that helps to focus light onto the retina.
• Iris: It controls the size of the pupil and regulates the amount of light entering the eye.
• Aqueous and vitreous humor: These are clear fluids that fill the front and back chambers of the eye, providing nourishment and maintaining the shape of the eye.
• Retina: It contains the light-sensitive cells that convert light into electrical signals for visual perception.
• Optic disc: It is the point where the optic nerve exits the eye, resulting in a blind spot in the visual field.
• Conjunctiva: It is a thin, transparent layer that covers the front surface of the eye and the inner surface of the eyelids.

After the dissection, you may hold up the lens and look through it to…ORDER CUSTOMIZED ANSWER HERE

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