The

MATERIALS NEEDED

textbook dissectible eye model compound microscope prepared microscope slide of a mammalian eye (sagittal section)

sheep or beef eye (fresh or preserved) dissecting tray dissecting instruments—forceps, sharp scissors, and dissecting needle

For Optional Activity:

ophthalmoscope

SAFETY

• Wear disposable gloves when working on the eye dissection.

• Dispose of tissue remnants and gloves as instructed.

• Wash the dissecting tray and instruments as instructed.

• Wash your laboratory table.

• Wash your hands before leaving the laboratory.

The eye contains photoreceptors, which are modified neurons located on its inner wall. Other parts of the eye provide protective functions or make it possible to move the eyeball. Still other structures serve to focus light entering the eye so that a sharp image is projected onto the receptor cells. Nerve impulses generated when the receptors are stimulated travel along the optic nerves to the brain, which interprets the impulses and creates the sensation of sight.

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