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 Goals1. 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 FunctionsStructures: •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 neuronsSENSORY

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 neuronsCarries 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?