FREE
ICE
CREAM
Tuesday
May 13 (4-8pm)
Nervous System Unit
Alzheimer’s Disease
• Memory loss
• Confusion
• Problems speaking,
understanding
• Time/place?
• Misplacing things
• Mood swings
• Personality change
(suspiciousness)
• Lack of interest
Alzheimer’s Disease
What do you notice
about the different
brain scans?
CT/MRI scan machine
Unit Goals
1. Structures and functions of
nervous system
1. Neurons: Role of neurons in
transmitting electrochemical
impulses
1. Three types of neurons
a) Sensory neurons
b) Interneurons
c) Motor neurons
1. Structures and Functions
Structures:
•brain
•spinal cord
•peripheral nerves
•neurons
Functions:
•Body’s response to
internal/external stimuli
•Control body functions
•Communication
1. Fun brain facts!
• 2% of body’s weight
• Uses 20% of body’s
blood supply
• Dieting can cause
brain to eat itself!
1. Fun spinal
cord facts!
• 8 cervical nerves
• 12 thoracic nerves
• 5 lumbar nerves
1. Fun facts about nerves!
• Sciatic nerve = longest
and widest nerve in your
body!
• Runs down lower back
and down the entire leg.
1. Fun fact!
• Human sciatic nerve
– 4 feet
• Giraffe sciatic nerve
– 8.5 to 10 feet
2. What is a neuron?
•
Neuron = Nerve cell
•
Carry messages
•
•
Electrical
•
Chemical
•
Called impulses
Three types
•
Sensory
•
Interneuron
•
Motor
It’s almost Friday!
Review! Neuron Anatomy
•
Cell body
•
Nucleus
•
Dendrites
•
Axon
•
Myelin sheath
•
Nodes
•
Axon terminals
Impulse carried from neuron to neuron!
Fun fact!
Neurons in the brain look strikingly similar to
images of the universe!
Divisions of Nervous System
Central Nervous System
• brain
• spinal cord
Peripheral Nervous System
• Sensory neurons
• Motor neurons
2. Neurons- Electrochemical Impulses
Impulse = Two signals
1) Electrical signal
1) Chemical signal
3. Three types of neurons
SENSORY
INTERNEURON
MOTOR
3. Three types of neurons
Sensory neurons:
carry information…
•From sensory organs
(eye, ears, skin)
•From sensory receptors
(temperature, pressure,
pain)
•To brain or spinal cord
3. Three types of neurons
Interneurons:
connect neurons
Found in…
•Brain
•Spinal cord
3. Three types of neurons
Motor neurons
Carries information…
From:
•brain
•spinal cord
To:
•Muscles (hand, leg)
•Glands (sweat, oil)
Video- “Brain Power: From Neurons to Networks”
Essential question: How are our neuron networks like
the internet?