Review of Medical Physiology - William F. Ganong 2002

Functions of the Nervous System
Vision
Introduction

The eyes are complex Sensory Organs that evolved from primitive light-sensitive spots on the body surface of invertebrates. Inside a protective covering, each eye contains a layer of receptors, a lens system that focuses light onto these receptors, and a network of Neural Pathways that transmits impulses from the receptors to the Brain. The Mechanism of interaction of these elements to ensure the perception of visual sensations will be considered in this section.



Last update: 10/08/2026

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