Chapter 35, Problem 1SA

Summary Introduction

To compare:

The simple nervous system of an animal that lack cephalization with the general organization features of a nervous system that exhibits cephalization. Also draw a simple nervous system of an animal that lack cephalization.

Introduction:

Cephalization is a feature of body plan by which the mouth, nerve ganglia, sense organs and other components of nervous system become concentrated at the one end of the body which resulted in the formation of head or front region. This feature evolved in most of multicellular animals independently at different times and is considered advantageous for the adaptations required for locomotion, to process sensory information and to detect prey.