8th Grade Cow Eye Dissection
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8th Grade Cow Eye Dissection |
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The lens of the eye does a portion of the focusing. However, it has to be stretched by muscles that are attached via suspensory ligaments. These muscles make up the ciliary body, which is located just behind the iris. Attached to the ciliary body are tiny fibers known as zonules. The zonules help the ciliary body control the lens by changing its shape. When the eye needs to focus on something up close, the ciliary body contracts and the zonules relax allowing the lens to thicken and focus on something near to the eye. When the eye needs to focus on distant objects, the ciliary body relaxes and the zonules contract, causing the lens to become thinner. As people get older, they generally develop a condition known as presbyopia, which is a difficulty reading. This occurs as the lens and ciliary body muscles lose elasticity. So when your doctor prescribes glasses, you’ll know why!
In order to see the ciliary body stretch the lens,
Check out our movie!
Once you’re done,
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By Jonathan S. and Kate C.