0:00

I want to give you another tool to localize

0:02

the intraparietal sulcus.

0:05

First, I'd like to draw it in the sagittal projection.

0:10

And then I'll show you this sign that you can use.

0:13

So, here it is as an arcuate shaped structure.

0:15

Remember, you don't see the whole thing

0:18

because it's so convoluted

0:19

and involuted from the surface of the brain.

0:21

It's very deep.

0:23

But if I were to show you exactly where

0:25

that spot was by cross-referencing it,

0:27

it corresponds right to this locus right here.

0:31

Now, we see part of it on this one cut.

0:34

And if I was to take the brain, as we did before,

0:38

and divide it up into 12 o'clock and 6 o'clock,

0:45

then we have at the widest biparietal diameter,

0:48

we've got 9 o'clock and 3 o'clock,

0:51

something like that.

0:53

And then we're going to take this sulcus,

0:54

which goes from 3 o'clock,

0:56

and it usually lands somewhere around here

0:58

at around 5 o'clock.

1:00

And then on the other side,

1:01

this would be 7 o'clock.

1:02

We can actually see it here at 7 o'clock.

1:05

Now, 75% of the time on the left side,

1:08

this intraparietal arcuate-shaped sulcus is continuous.

1:11

In this case, it's a little bit broken in the back.

1:14

On the right side, it's a little more disorganized,

1:17

so it's hard to pick it out from the

1:18

9 o'clock to the 6 o'clock position.

1:20

So, it's a little easier on the left and then you

1:22

extrapolate on the right just to make it work,

1:25

So if I take these lines away, you can see it now.

1:27

There it is right there,

1:29

going from 3 o'clock to approximately 5 o'clock,

1:33

maybe a little bit past 5 o'clock,

1:35

in the posterior aspect of the left parietal region

1:39

of the brain. The intraparietal sulcus,

1:41

the clock face sign for identifying it as the divider

1:45

of the superior and inferior parietal lobule.

Localizing the Intraparietal Lobule Part 2

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