Record 3 observations you made when you examined the surface of the eye. Have your students work in pairs on the cow eye dissection. What is the purpose of the fatty tissue surrounding the eye. The cow eye is an excellent specimen to use, because it is very similar to the human eye which makes comparing the structures very relevant. Match the following parts of the eye to their function. Instruct your students to put on the appropriate ppe gloves, gowns, etc. This manual explains how to do a dissection of a cow or other mammalian eye. Keep your hands away from your mouth and eyes when handling the cows eye. Learn cow eye dissection with free interactive flashcards.
It is designed to supplement a real dissection or used for students who cannot complete the laboratory experience. The cow eye dissection lab what are the structures of the mammalian eye and how do they function. Ciliary muscles produces aqueous humor and controls lens shape. In dissecting the eye, it is important to note the aspect in which the structures are located anterior, posterior, superior, inferior, lateral, medial etc. B if your budget does not allow for each student to conduct a cows eye dissection, then divide students into groups or conduct the dissection as a demonstration. Cow eye dissection andlabelby leslie youngsection 63 2. The most noticeable part of the eye is the large mass of gray tissue that surrounds the posterior back of the eye and is attached to the sclera. The second most noticeable part of the eye is the cornea, located in the anterior front part of the eye. The black, anterior part of the choroid that looks like the underside of a mushroom is the ciliary body. In this lab, we set out to dissect a cows eye and identify the different parts of the eye. Cows eye dissection do your own download stepbystep instructions pdf file for doing your own cows eye dissection.
Practical activity one eye dissection and uv absorption. In this method, a full thickness scleral flap in an enucleated porcine eye is first created and through this, the choroid tissue can be separated. Cows eye dissection page 4 use your scissors to cut around the middle of the eye, cutting the eye in half. The objective was to gain a better understanding of the structure and the function of the eye. First, identify the most external structures of the eye. Feb 04, 2014 cow eye dissection for educational use.
What is one major difference between a cow s eye and a humans eye. The blue is the cornea, which starts out clear but becomes cloudy after death. Also, the cow eyes can be rather slippery, so use caution when handling and cutting them. If this is the case, have them move on to the eye model and comparative neuroanatomy activities. The mammalian eye consists of many specialized cells and tissues that make up several different structures. Colored ring of muscle that changes the size of the pupil. The cornea is the transparent front part of the eye that coversthe iris, pupil, and anterior chamber.
The eye is a special sensory organ with a complex structure and function. One eye of choice for dissection, that closely resembles. Cow eye dissection mbusd internet usage disclaimer. You can order cows eyes at a butcher shop or purchase them. This is cow eye dissection by escience labs on vimeo, the home for high quality videos and the people who love them. Chp 12 cow eye dissection report lab experiment cow eye. The white part is the sclera, the outer covering of the eyeball. For dissection of a retina, first cut off the anterior part of the eye, i. Feb 04, 2014 part ii cow eye dissection for educational use. If everything else is finished, read through this information to familarize yourself with the dissection process.
Ensure you discard of all the cow eye parts as instructed by your teacher. Cut away the fat and muscle, this may only be necessary if fat is covering the cornea of the eye and is in your way. Dissection of the cow eye please make sure to wear gloves and safety glasses when you are dissecting, and make sure to clean up thoroughly after the lab. Click watch online answer the questions as you watch each video. Practical activity two binocular vision and the illusory pendulum. The purpose of this lab was to explore the anatomy of a cow eye. One benefit of a cow eye dissection is that by examining the anatomy of a preserved eye, you can learn how your own eye forms images of the world and sends them to your brain. The most noticeable part of the eye is the large mass of gray tissue that surrounds the posterior of the eye and is attached to the sclera. Cow eye dissection lab if everything else is finished, read through this information to familarize yourself with the dissection process. Cow eye dissection lab lowell middlesex academy charter school. Cow eye dissection is popular because of how similar a cow s eye is to the human eye. On the inside of the back half of the eyeball, you can see some blood.
We use cookies to provide you with a great user experience. Due to the fact that the eye has been preserved, the cornea is cloudy and bluishgray in color. Sheep eye dissection procedures the anatomy of the human eye can be better shown and understood by the actual dissection of an eye. After removing the excess tissue, the sclera and optic nerve should be exposed but still intact. The kit provides a stepbystep student guide with labeled color images for 1 or 2 students to participate in an introductorylevel dissection activity that includes locating and identifying external and internal features of the eye. The structures have certain functions and together, they form images that are interpreted by the brain. Fat around the backside of the eye can be left alone. This step by step guide shows the dissection of a cow eye in images. It includes stepbystep instructions as well as clear color photographs to help you identify parts. Play this quiz called cow eye dissection and show off your skills.
Chp 12 cow eye dissection report lab experiment cow eye dissection 1 identify the following structures cornea a clear covering over the front of the. The cow eye is ideal because its large size makes for easy identification of the eye s components. Cow eye use the point of a scissors or a scalpel to make an incision through the layers of the eye capsule similar to figure 1. To learn about how your eyes work, you can dissect, or take apart, a cows eye. The cornea is made of pretty tough stuffit helps protect your eye. Cornea optic nerve vitreous humor retina optic disc blind spot choroid tapetum lucidum sclera aqueous humor suspensory ligaments lens ciliary body pupil iris provided by dissection 101. It contains smooth muscle that changes the shape of the lens so that the eye can focus on objects in the near distance. In your cows eye, the cornea may be cloudy or blue in color. There are several different ways you can use this lesson in the classroom. Learn vocabulary, terms, and more with flashcards, games, and other study tools. Lens bends light rays to the back of the eye retina. If the vitreous humor is still in the eyeball, empty it out.
The cornea, with the anterior chamberand lens, refracts light. In this experiment, students will dissect a cows eye to learn the anatomy of the eye, and compare and contrast a cows eye and a human eye. Scalpels and razors can cut you as easily as they cut cow eyes. Choose from 500 different sets of cow eye dissection flashcards on quizlet. To make the dissection experience for your students. Hands on activities such as carrying out an eye dissection are extremely engaging and. Cow eye dissection use this presentation as your virtual cow eye dissection, or use it as a guide for your actual classroom dissection recommended. Name the three layers you sliced through when you cut across the top. One eye of choice for dissection, that closely resembles the human eye, is that of the sheep. Before allowing students to begin the dissection activity, provide them with clear instructions and. Name the three layers you sliced through when you cut across the top of the eye. Whole vitreous humor dissection for vitreodynamic analysis ncbi.
If you are following along at school, please be careful. In the rare occasions where neither eye can see a particular spot, the brain fills in the spot using the surrounding background information it receives from the eye. Make sure you wash your hands and all utensils after completing the dissection to ensure that all bacteria has been washed off. The cow eye is also large which makes the dissection and identification simple, but very effective. The anatomy of the human eye can be better shown and understood by the actual dissection of an eye. Cows eye dissection page 6 now take a look at the rest of the eye. They dissect cow eyes to show the functions similar to a human eye. Cow eye dissection guide project home science tools. Mar 22, 2015 the cow eye dissection is a great lesson to use as part of your unit on the nervous system and the five senses. Please allow 30 minutes to 6 hours time depending upon the size of the video. The carolina mammal eye dissection guide is a general set of instructions for dissecting mammal eyes. When you cut the eyeball, a clear watery fluid leaked out. This dissection guide was revised october 2014 with improved instructions and color images for a better dissection and easier identification of internal and. In order to faciliate the insertion of the scissors, fix the eyeball with.
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