0:00

Let's talk about the gyri and sulci anatomy,

0:02

and the midline sagittal projection.

0:03

We have a terrific landmark,

0:05

namely the corpus callosum with the lamina terminalis,

0:09

the rostrum, the genu,

0:11

the body and the splenium of the corpus callosum.

0:14

And the orientation of the anatomy is somewhat radial to

0:17

a central structure, kind of the center of the clock,

0:20

which is the foramen of Monro.

0:23

Now, if we follow the cingulate sulcus around and back,

0:27

it exits about two-thirds of the way back on the brain,

0:30

near the midline or at the midline.

0:32

And this is known as the pars marginalis.

0:34

A terrific landmark,

0:36

it is, because just anterior to it

0:38

is this perpendicularly shaped structure,

0:41

perpendicular orientation to the pars marginalis,

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kind of obliquely oriented,

0:45

the central sulcus of Rolando.

0:47

Now, another structure is the paracentral

0:52

sulcus just anterior to this.

0:53

You can either find it coming from the top in front

0:56

of the central sulcus or coming from the bottom,

0:59

as it does here, and followed around as the

1:02

continuation of the cingulate sulcus.

1:04

And this is known as the paracentral sulcus.

1:07

That's relevant because this is the paracentral lobule.

1:10

So you've got cuneus, precuneus, paracentral lobule,

1:14

paracentral sulcus, central sulcus, pars

1:18

marginalis or marginal sulcus,

1:20

and the cingulate sulcus with the additional

1:23

anatomy already described.

1:25

Pomeranz out.

Pars Marginalis

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