And then there's angular acceleration, which has,

also has three planes, like this, like this, and like that.

So, a plane of, of rotation that's like this, a plane of rotation

that's like this, and a plane of rotation that would swing your hea, head around.

This plane, by the way, is called the yaw plane.

Okay, so how do we sense this?

Well, as I said before, we have essentially what is an inner tube.

And so, that if we swirl around, the fluid in here swirls around, but the,

the bone, the, the, the edge of, of the inner tube doesn't move.

So, there's relative motion of the fluid, and

we're going to then sense that using hair cells, at,

at, at a, at one point in the inner tube.

And similarly, there's an, there's an inner tube that is sitting in this plane,

and in this plane, going like this, and going like that.

And, that allows us to sense, angular acceleration

in any plane of, of rotation.

So, what does that look like?

What we're looking at here, let me actually go back,

what we're looking at is a dissected bone that is,

that is essentially this part where the top of the inner ear,

this, this petrous bone has been removed.

And, now we're going to look at it from the side.