0:00

I want to give you another tool for locating

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or localizing the intraparietal sulcus.

0:06

Let's bifurcate the brain, as we have in prior vignettes.

0:10

Let's use the 12 o'clock designation anteriorly.

0:13

We'll cut the brain in half, 6 o'clock in the back.

0:17

Widest biparietal diameter, nine and three.

0:20

This would be 5 o'clock.

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This would be 7 o'clock.

0:23

We already said in prior vignette that coming out at the

0:27

5 o'clock position is the back portion of the arcuate shaped

0:32

intraparietal sulcus. Now, on the left side,

0:35

75% of the time, it's continuous.

0:38

On the right side, it's frequently broken.

0:40

So you may only see the exit and you may have to

0:42

gerrymander it or infer it from looking

0:45

at the more consistent left side.

0:48

Now, another way to go at this is to look

0:51

at the sagittal projection.

0:53

Here's the operculum.

0:55

And right in the back is the staircase

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descending precentral sulcus,

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precentral gyrus, central sulcus of Rolando.

1:05

Let's tap that. Cross-reference it,

1:08

now you got your central sulcus.

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If you got your central sulcus, easy.

1:12

Precentral gyrus, postcentral gyrus,

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postcentral sulcus.

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Now, that you have postcentral sulcus,

1:20

you'll know that it's the upswing of the intraparietal sulcus,

1:25

so that must be the intraparietal sulcus.

1:28

Therefore, that has to be the superior parietal lobule.

1:32

That has to be the inferior parietal lobule.

1:34

And you're home.

Localizing the Intraparietal Lobule Part 3

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