The Nervous System

The nervous system is the part of an animal's body that coordinates its voluntary and involuntary actions and transmits signals between different parts of its body.

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Central Nervous System

The Central Nervous System is located inside your head and contains the amazing brain.

There are three main sections, called the cerebrum, the cerebellum, and the brain stem.


The cerebrum covers most of the brain, including the four lobes, and a couple of cortices.

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Frontal Lobe

The frontal lobe is the largest and most significant part of the brain. It controls your thinking, learning, judgement, planning, and logic.

Occipital Lobe

Your occipital lobe is responsible for your vision and contains most of the anatomical region of the visual cortex.

Parietal Lobe

This area is used for your senses. The major sensory inputs from the receptors such as pain, temperature, and touch relay through the thalamus to the parietal lobe.

Temporal Lobe

This lobe is found on the sides of your head, and is responsible for speech, memorization, hearing, and smell.

Cerebellum & Brain Stem

These areas are outside of the cerebrum but still inside the brain. The cerebellum helps your balance, and the brain stem manages all the things we do without really thinking about it like blinking, breathing, and heart pump.


Peripheral Nervous System

The peripheral nervous system is the part of an animal's body that coordinates its voluntary and involuntary actions, and it  transmits signals between different parts of its body, using nerves that are spread throughout it.


There is a fly on your left hand. It is incredibly annoying! Your brain sends a signal through your nerves and into your right hand in order to move and slap the left hand.

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- There are more nerve cells in the human brain than there are stars in the Milky Way.

- If we lined up all the neurons in our body it would be around 600 miles long.

- There are 100 billion neurons in your brain alone.

- A newborn baby's brain grows almost 3 times in size during the course of its first year.

- The left side of human brain controls the right side of the body and the right side of the brain controls the left side of the body.

- A newborn baby has about half of the nerve cells it had before it was born.

- As we get older, the brain loses almost one gram per year.

- There are about 13,500,00 neurons in the human spinal cord.

- The total surface area of the human brain is about 25,000 square cm.

- Only four percent of the brain's cells work while the remaining cells are kept in reserve.

- The Nervous System can transmit impulses as fast as 100 metres per second.


How do we know what we know? Where is information biologically stored in the brain? And how do we know that what we know, is real? We are a long way from answering this question, but epistemology is very fascinating.

(video by Vsauce)

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Sources: Wikipedia.

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