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Our Sheep Eye Dissection:

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by

Vic Awesomeness

on 16 March 2016

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Transcript of Our Sheep Eye Dissection:

Stage 1:Outside the Eye
When we first got the eye, we observed it and found The cornea(the dark spot in front), the pupil which was surrounded by the iris , the optic nerve that was located at the back of the eye and a lot of fat (white tissue surrounding the eye) surrounding the eye. We believe that the fat surrounding the eye was meant to preserve it and to keep it from being bruised by the cranium. It might also be a shield that protects the eye from dust or any dirt material. As we observed the eye even further, we noticed that it felt squishy (kinda like a boiled egg) this, might have been caused by the different variety in liquids that fill up the eye such as the Aqueous humor or the virtuous humor. The cornea been dark might have been a result of the chemicals the eye was encased in or just because of the color of the iris.
Our Sheep Eye Dissection
By:Victor,Hafsa,Gabriel,Alex,Jolene
Stage 2: Fat and Muscle
As we cut away the fat, the muscle underneath became visible.There are six muscles around the eye that control its movements, these muscle are known as the extra ocular muscles. The primary function of the four rectum muscles is to control the eye's movements from left to right and up and down. The two oblique muscles move the eye rotate the eyes inward and outward.All six muscles work in unison to move the eye. As one contracts, the opposing muscle relaxes, creating smooth movements. In addition to the muscles of one eye working together in a coordinated effort, the muscles of both eyes work in unison so that the eyes are always aligned. As you can see the optic nerve is also visible.
Stage 3: The Cornea Analysis
The clear liquid underneath the Cornea, as mentioned before is known as the Aqueous humor. The Aqueous humor is a gelatinous fluid that inflates the globe of the eye. It is a thin, watery fluid that fills the space between the cornea and the iris (anterior chamber). Its main function is to maintain the cornea and the lens and it gives the eye it's shape. After the Cornea was cut away, the structures beneath it became clear and visible revealing the pupil, the iris and the lens.
Stage 4: Inside of the Eye.
In this stage we cut open eye. We used the scalpel to cut through the middle of the eye and found lens , the retina, the bottom of the iris and the pupil. The clear jelly-like substance is the vitreous humor. It is a clear gel that occupies the space behind the lens and before the retina at the back of the eye. Because the eye must process visual data, this liquid must be clear enough that light can easily pass through. It is mostly the reason for the eye's spherical shape. We couldn't see the rods and the cones because they were way too small.
Stage 6: Iris analysis
The iris contracts and expands the pupil. If only little light is exposed, the iris will contract itself thereby expanding the pupil. In a reverse situation, it will expand and contract the pupil.
Stage 8:Optic Nerve Analysis
Stage 7: Retina and the back of the eye.
The optic nerve is a connective route from the eye to the brain. Any sustained damage may cause the owner to experience difficulty translating images. Thereby leading to reduced vision or blindness.
The retina is the thin layer that lines the back of the eye. The retina -in our case- was whitish yellowish, it almost felt rubbery,but still very delicate. Behind the retina was a bluish layer called Tapetum Lucidum. it reflects visible light back through the retina, increasing the light available to the photo receptors, though blurring the initial image of the light on focus. Because of this specialized reflective tissue, some animals that contain it are able to see more in the dark.
Conclusion
The dissection was fairly simple, It was gross,but oddly compelling. I never thought I would've enjoyed it as much as i did. Touching the eye felt alien,but the feeling wasn't one to run from. The steps of the dissection were fairly simple but at the same time complex and hard to understand. We learned that we actually see due to the optic nerve. We also learned that that the iris is the part of the eye that gives us the color of our eyes.Even though in our case the iris was brown but the pupil was grey. Both the sheep eye and the human eye have camera eyes. Our favorite part of the dissection is when we were cutting it open,and the liquid (vitreous humor) was pouring out. That was our favorite because it was fun watching the liquid gush out. I actually enjoyed this assignment. Also we learned that if one structures in the eye fails to do its job, then the eye as a whole fails as well.

Stage 5: Lens Analysis
The iris was pale red? A little rough on the outside and was a little cloudy too.I don't believe that a sheep would have been able to with lenses that aren't even clear enough to see through. It must've absorbed all the chemicals that it was placed in.
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