In Animals with a Brain, What Are the Two Major

question 153

Multiple Choice

In animals with a brain, what are the two major divisions of the nervous system?

• A) cranial and spinal nerves
• B) central and peripheral nervous systems
• C) nerves from the brain and the peripheral systems
• D) autonomic and peripheral systems

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Definitions:

Schwann Cells

The principal glia of the peripheral nervous system, responsible for the formation of myelin.

Peripheral Nervous System

The part of the nervous system outside the brain and spinal cord, comprising nerves that connect the central nervous system to limbs and organs, essential for relaying sensory and motor information.

Myelin

A fatty substance that surrounds the axons of many neurons, acting as insulation to speed the transmission of electrical impulses.

Myelin

A fatty substance that surrounds and insulates the axons of many neurons, enabling faster transmission of electrical signals.