1. Nervous System
In Class Notes

2. Function & Divisions: Functions: Divisions (2)
Control/coordinate body movements
Process information/sensory stimulus
Store memories
Divisions (2)
CNS (Central Nervous System)
Brain & Spinal Cord
Processes all information
PNS (Peripheral Nervous System)
All other nervous tissue
Transmits signals/messages

3. Brain: Parts & Functions
Brainstem = filters info
Controls vital functions (breathing, heart rate)
Cerebrum=2 hemispheres (right & left)
Control of movement
Thalamus= filters all stimulus
Cerebellum= transfers stimulus to motor neurons (muscles)
Involved in memories & balance
Hypothalamus = maintains homeostasis

4. Parts of the Brain:

5. Lobes of the Brain & Functions:
Frontal = speech & movement
Parietal = speech, reading, touch & taste
Occipital = vision
Temporal = hearing & smell

6. The Neuron:

7. Function of the Neuron:
In order for a neuron (nerve cell) to fire it requires a stimulus
All or nothing…NOT like a dimmer on a light
Stimulus starts at dendrite
Signal moves down axon
Reaches the knob
Must cross the synaptic cleft

8. From one neuron to the next:
In order to cross a synaptic cleft it must use a chemical signal
neurotransmitter

9. Reflex Arc: Uses 3 Parts: Provides protection
Sensory receptor (neuron)
Receives stimulus
Spinal Cord
Recognizes stimulus
Motor receptor (muscle)
Contracts muscle to cause movement
Provides protection
Examples: heat, cold, pain

10. Reflex Arc:

11. Examples of Sensory Receptors:
Mechanoreceptors - touch, pressure, stretching, motion
Photoreceptors - light
Thermoreceptors - heat
Pain receptors – pain
Chemoreceptors - chemicals

12. Drugs: 2 Types: Stimulants: increase CNS Activity
Caffeine, nicotine, cocaine
Depressants: decrease CNS Activity
Morphine, Vicodin, Opiates

13. Illnesses: Alzheimers Tourette Syndrome Lou Gehrigs Huntingtons
Muscular Dystrophy
ADD
Etc.