00:00Grey matter and white matter. Here's a brain. Here's a spinal cord. If we open up the brain, we see grey matter around the outside.
00:10And it's folded to give more room for the grey matter. Why? Well, in the human brain, we maybe have 80 or 90 or 100 billion neurons in the central nervous system.
00:20But in the grey matter, this is where we find the cell bodies of those neurons. And this is where we find the connections.
00:27And there are possibly 100 trillion connections in the grey matter. And that's what gives us our complexity.
00:34These neurons send information through their axons through the white matter in the middle of the brain and down to the spinal cord where we find the white matter on the outside.
00:44This is going to and from the brain. And the grey matter in the centre of the spinal cord connects these neurons to nerves leaving and entering from the body.
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