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8 grade students dissect cow eyes
Our 8th graders were recently engrossed by Mrs. Cindy Sanchez, from the Arizona
Science Center, and her fabulous cow eye dissection lab. Mrs. Sanchez used our
class as a test run on the new laboratory that the Arizona Science Center is going to
implement this next year.
Mrs. Sanchez brought 15 cow eyes for our students to dissect along with an
interactive DVD for the students to watch before they made the cuts into the eye.
Mrs. Sanchez explained each part of the eyeball to the students before the students
began the laboratory. The students started by cutting into the Cornea and removing
it, then they were to gently pull the Iris out from underneath the cut that was just
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made from removing the Cornea. After removing the Iris, they were instructed to pull out the lens and along with
that the gelatinous membrane that makes the eyeball its round shape.
“The lens was hard on top, but the membrane was like Jello!” Billy Hues and Craig Gallagher exclaimed as they
squished it in their hands. After looking at the lens, the students were instructed by Mrs. Sanchez to cut the sides of
the eyeball and to flip it inside out. The last thing that they looked at was the muscles on either sides of the eye.
When asked what the muscles do, Mrs. Sanchez held her finger out and slowing pulled it towards her, explaining
that she feels her muscles on the sides of her eye straining to focus as the slowing moving finger reaches her face.
