1. Functions of the Nervous System
Chapter 9
Functions of the Nervous System

2. Nervous System Allows us to feel, think, remember, and move
Nervous tissue is found in the brain, spinal cord, and nerves
Composed of Neurons: nerve cells, that are specialized to react to physical & chemical changes in their surroundings

3. Neuron Components
Cell Body- the rounded area that contains 2 different types of extensions
1. dendrites- numerous branches; receive the electromechanical messages.
2. Axons- extensions that send information; usually 1 axon.
Myelin sheath- covers axons; formed by Schwann Cells

5. Nervous Tissue made up of: Neurons: nerve cells
Neuroglial cells: helper cells
“glia” = glue
Support and bind components of nervous tissue to each other and to blood vessels
Function similarly to connective tissue in other organ systems

6. Nervous System
Organs in the Nervous System can be divided into 2 groups:
1. Central Nervous System (CNS): consists of the brain & spinal cord
2. Peripheral Nervous System (PNS): Connects the CNS to other body parts.

7. Functions
3 general functions
1. sensory
2. integrative
3. motor

8. Sensory Sensory receptors detect changes inside and outside the body
External environmental factors: light and sound
Internal environmental factors: body temperature and oxygen concentration

9. Integrative
Interneurons transfer and interpret results

10. Motor
Send appropriate impulses/messages to the muscles and glands for movement.