The human brain contains over 100 billion neurons that process signals from external stimuli. Sensory neurons detect stimuli and convert them into electrochemical signals that travel through the peripheral and central nervous systems to the brain. In the brain, interneurons transmit signals between neurons until the relevant neurons are activated, causing electrochemical reactions that trigger responses by motor neurons through the peripheral nervous system.

1. Learning to Learn The Human Brain & Thinking

2. 100,000,000,000 neurons!

3. Stimulus from the outside world

4. Changed into an electrochemical signal by the sensory neuron affected

5. Signal travels through peripheral nervous system (PNS)

6. Signal reaches the central nervous system (CNS) – protected by the spine

7. Signal travels up the CNS and into the brain

8. Signal reaches the brain, where it will be processed

9. Signal travels via interneurons through the brain to reach the specific neurons that will process and respond

10. Signal reaches the cell body of the relevant neuron

11. Signal travels down the axon to the synaptic gap

12. The signal will need to jump across the gap between the two synapses

13. Signal triggers a chemical reaction in the presynaptic terminal

14. Chemical signal travels across synaptic gap

15. Chemical signal is received and travels along dendrite to the next neuron’s cell body

16. Processed information triggers an electrochemical reaction. It will travel the reverse route from CNS to motor neurons in the PNS which will activate the body’s response