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Published byYuliani Sudjarwadi Modified over 5 years ago
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Structures of the Eye and Sheep Eye Dissection Prep
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The Eye
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Eye: sense organ that receives light and focuses it; sending impulses to the brain
3 Main Parts Sclera: Outer Layer of Eye tough white outer tissue of the eye Choroid: Middle Layer of Eye Retina—inner layer of the eye
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Credit: National Library of Medicine, National Institutes of Health
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Sclera: Outer Layer of the Eye
Sclera: white outer covering of the eye provides support and shape. Cornea: Clear layer at the front of eye where light passes.
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Choroid: Middle Layer of Eye
Pupil: Opening where light enters; looks like a black spot Choroid: The middle layer of the eye. Iris: Colored layer of the choroid; controls the size of the pupil
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Retina: Inner Layer of the Eye
Retina: Covering along the inside of the eye; contains neurons called rods and cones
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Other Eye Structures Vitreous humor: clear substance (jelly-like) inside the eye; Aqueous humor: clear liquid that fills area between cornea and the lens; constantly is being replaced by body
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Other Eye Structures Lens: Focuses Light onto the retina
Optic Nerve: Carries impulses from the eye to the brain
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Structures of the eye Aqueous humor Choroid
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Sheep Eye Dissection
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Step 1: Locate External Structures
Locate cornea, sclera, optic nerve
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Step 2: Begin Dissection
Using your scalpel cut into the eye at the junction of the sclera and the cornea Make incision with the scalpel and then cut around the cornea with the scissors
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Step 3: Separate eye and identify structures
Separate the front of the eye and set aside Identify the structures of the back of the eye Aqueous humor (watery liquid) Victreous humor (jelly-like liquid) Retina/Blind Spot (where optic nerve attaches) Lens (looks like marble)
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Step 4: Identify structures of front section of eye
Cornea (clear covering at front of eye) Iris (colored section of eye) Pupil (opening through iris)
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Review Activity
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Sclera: Outer Layer of the Eye
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