And a neuron, well, that's smaller than brain.

And a neuron, well, that's smaller than brain.

The neuron, and then she looked and did this.

and she says, The neuron? The neuron, and then she looked and did this.

Let's look at neurons.

So if I were to draw a neuron let me pick a better color.

And it's a beautifully complex neuron.

And this neuron right here, this is called the presynaptic neuron.

This is the post synaptic neuron.

Every neuron is different.

But this is just a single neuron.

It's called the axon.

http link.springer.com article 10.1007 2FBF02478259 A.S. Samardak, A. Nogaret, N. B. Janson, A. G. Balanov, I. Farrer and D. A. Ritchie.

So that's essentially how it happens.

You take this DNA and you put it into a neuron.

So this is where it receives the signal.

So let's say that this neuron is exciting this dendrite.

And each neuron itself is largely unique.

I edited out the last bit when I asked, Where is the neuron?

You could have hundreds or thousands of synapses even, into one neuron or going out of one neuron.

like putting solar panels on a roof, and the next thing you know, you have a neuron which can be activated with light.

We can turn a skin cell into a heart cell or a neuro cell.

We could say that a neuron in the brain would be like a web page in the Internet.

So what I want to do is first to show you what a neuron looks like.

So how does a place cell know where the rat or person is within its environment?

How does one prove that a neuron was born at a particular time?

In this diagram, every node is a neuron, and every line is a connection.

Each neuron is connected via synapses to up to 10,000 other neurons in your brain.

I edited out the last bit when I asked, Where is the neuron? and she says, The neuron?

In this diagram, every node is a neuron, and every line is a connection.

This is how the main player in our brain looks like, that is, a neuron.

So what we see is that this neuron knows whenever the rat has gone into one particular place in its environment.

a fleet of microscopes will capture every neuron and every synapse in a vast database of images.

Because it's as though this neuron is adopting the other person's point of view.

You see here a neuron with its dendrite and the small red dots are the dendritic spines.

And so when the green neuron wants to communicate, it wants to send a message to the red neuron, it spits out neurotransmitter.

And so, when you start to look at emergent systems, you can look at a neuron under a microscope.

It could be a muscle cell or in probably most cases of the human body it's exciting another neuron.

Only one of every three job seekers finds a job, but the overproduction is probably worthwhile, for it ensures that as a replaceable neuron dies, there will already be, in its vicinity, a younger one ready to take its place.

It makes these vesicles dump their contents in the synaptic cleft and then that will make other sodium gates open up and then that will stimulate this neuron, but if it makes potassium gates open up, then it will inhibit it and that's how, frankly, these synapses work.

And you can see that the green neuron touches the red neuron at two locations, and these are what are called synapses.

This might be a synapse with one neuron, another one, another one, another one.

The neuron uses its natural protein making machinery to fabricate these little light sensitive proteins and install them all over the cell, like putting solar panels on a roof, and the next thing you know, you have a neuron which can be activated with light.

Every neuron and its cellular lineage has been recorded and most, if not all, of the neural connections are known.

But up in the corner, in the right corner, you'll see, at the same scale, a visual interneuron from a fly.