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.

Essentials of Human Physiology

Essentials of Human Physiology

This ebook provides an introductory explanation of the workings of the human body, with an effort to draw connections between the body systems and explain their interdependencies. A framework for the book is homeostasis and how the body maintains balance within each system. This is intended as a first introduction to physiology for a college-level course.

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