1. The Nervous System!
Chapter 9

2. Several people or one person?

3. What is the nervous system?
A network of nerve cells (neurons) that transmits signals throughout the body
Arm levitation (don’t write this down)
Functions?
To detect changes (sensory neurons)
To make a decision (associative neurons)
To respond (motor neurons)

4. Old Lady or Young Woman?

6. How many legs does this elephant have?

7. 3 Types of Neurons Sensory neurons (afferent)
Found on skin or other sensory organs (eyes, tongue, within nose, etc)
Carry impulses to spinal cord and brain
Associative neurons (interneurons)
Carry impulses from sensory neurons to motor neurons
Make decisions
Motor neurons (efferent)
Carry messages from brain and spinal cord to muscles and glands

9. How does an impulse work?
A stimulus creates an impulse
Impulse travels into neuron through dendrites and out through axon
Neurotransmitter is released and carries impulse across the synapse

11. Divisions of Nervous System
Central Nervous System (CNS)
Main communication system of body
Consists of brain and spinal cord
Peripheral Nervous System (PNS)
Cranial nerves and spinal nerves
Somatic Nervous System- controls voluntary movements of skeletal muscle
Autonomic Nervous System- controls involuntary actions of organs (smooth) and heart (cardiac)

12. Drowning?
Or Safe?

13. DIVISIONS OF NERVOUS SYSTEM

14. Define the following: Meninges Dura mater Cerebrospinal fluid
Spinal cord
Brain
Cerebrum
Cerebellum
brainstem