Chapter 16.5, Problem 4AYLO

Summary Introduction

To discuss:

The anatomy and functions of the eyebrows, eyelids, eyelashes, and conjunctiva.

Introduction:

The perception of items that are present in the surroundings is termed as sight or vision. This perception occurs by means of reflection or emission of light from those objects. The retina, the neural component, is one of the principle components of the eyeball. It consists of three cell layers, and these cell layers are composed of ganglion cells, bipolar cells, and photoreceptor cells. The photoreceptor cells are involved in the absorption of light and produce a chemical or an electrical signal. These cells are of three kinds, namely cones, rods, and some ganglion cells. These cone and rod cells generate visual images, and these cells are related to ependymal cells located in the brain.