Your Brain is Hollow!

Let's zoom in and show you a really cool membrane called the septum palucidum. On the other side of this membrane is a hollow chamber called the lateral ventricle. Each cerebral hemisphere has a lateral ventricle, a left and a right. And this is where cerebral spinal fluid is produced. If I show you the other half of the brain here and I turn it over, you can see what that hollow chamber would look like on the other side of that septum pollucidum.