Nerve Network Slides
Nerve Network Relay
How Your Body Sends Lightning-Fast Messages
The Telephone Game
One person whispers a secret message to their neighbor... they pass it on... and on... until the last person!
Start
Message
End
Did the message stay the same?
The Haircut Mystery
Finger Ouch!
A small cut on your finger really hurts.
Haircut Fine?
Cutting your hair or nails doesn't hurt at all!
WHY? Let's find out!
Watch: Why Don't Haircuts Hurt?
Embedded media
Focus: 1:47 - 2:00 (The Signal Path)
The Message Trail
1. SKIN
Touch!
2. NERVES
Travel
3. SPINE
Main Line
4. BRAIN
Decode!
Nerve Relay Game
1
Divide into groups of 4.
2
Assign roles: Skin, Arm, Spine, Brain.
3
Skin passes the signal (stress ball) down the line.
4
Brain identifies the feeling using the card!
GO FAST!
Nerves send messages in less than a second!
Neural Messenger Teacher Guide
Neural Messenger
Teacher Facilitation Guide
1st - 2nd Grade
LEARNING OBJECTIVE
Students will model how sensory messages travel from the skin, through the arm and spinal cord, to the brain using a physical relay.
KEY VOCABULARY
Nerves: Messengers that carry info.
Spinal Cord: The main message highway.
Decode: When the brain understands.
Sensory: Things we feel or touch.
MATERIALS
- Nerve Network Slides
- Signal Cards (Printed)
- Stress balls or Bean bags
- Signal Path Worksheet
Instructional Pacing
5 min
Hook
Telephone Game
Sit students in a circle. Whisper a simple message (e.g., "The cat is on the mat") to one student. Have them pass it along. At the end, discuss: Was it fast? Did the message change? Explain that nerves pass messages just like this, but much faster!
5 min
Watch
SciShow Kids Exploration
Show video. Critical Moment: Pause at 1:55 and have students trace the path on their own bodies: Finger → Arm → Back → Head. Ask: "Why don't haircuts hurt?" (Answer: No nerves in hair!)
20 min
Relay
The Nerve Network Relay
- Divide class into groups of 4 (Skin, Arm, Spine, Brain).
- Skin: Receives the stress ball and passes it to Arm.
- Arm & Spine: Pass the ball as fast as possible.
- Brain: Grabs a Signal Card to "identify" the feeling.
- Challenge: Can they pass the message in under 3 seconds?
5 min
Wrap
The Signal Path Worksheet
Students trace and label the path on their worksheets. Remind them that without the brain, we wouldn't know what we were touching—we'd just feel a signal!
Misconception Alert
Students often think hair itself has feelings. Remind them that pulling hair hurts because you are pulling on the skin of the scalp, which has nerves, but the hair strand itself is "nerve-free."
Sensation Signal Cards
Sensation Signal Cards
Cut these out for the "Brain" player to use!
Hot
HOT COCOA
Warm and Steamy
Cold
ICE CUBE
Chilly and Slick
Pain
CACTUS
Sharp and Prickly
Soft
FEATHER
Light and Fluffy
Cut along the dashed lines. Lamination recommended for classroom reuse.
Signal Path Worksheet
Signal Path Diagram
Trace the message from finger to brain!
Name
Date
Use the word bank to label the four main parts of the Nerve Network.
BRAIN
SKIN
ARM NERVES
SPINAL CORD
1. Why don't haircuts hurt?
2. How fast do nerves work?
Very Slow
Super Fast
Signal Path Answer Key
Signal Path Answer Key
Teacher Resource • Nerve Network Relay
BRAIN
SPINAL CORD
SKIN
ARM NERVES
1. Why don't haircuts hurt?
"Because hair and nails do not have nerves inside of them. No nerves means no sense of touch and no pain."
2. How fast do nerves work?
Very Slow
SUPER FAST
Teacher Tip: During the relay, if students miss a step, use that as a "nerve glitch" moment to discuss what happens if the message doesn't reach the brain!
