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Welcome to our introduction on MR of Neuroanatomy.

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I'm going to start out with a very basic,

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basic approach to neuroanatomy with a sagittal flare,

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three-dimensional,

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1 mm image in the midline showing you the brainstem,

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the medulla with the medullary clava,

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the medulla pontine sulcus, the pons, the midbrain.

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And you see the mammillary body is a nice little landmark

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anterior to it. There's a pituitary gland and fossa.

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Now, we're going to drill into each one

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of these subjects separately.

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We've got the collicular plate,

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the inferior colliculus and the superior colliculus.

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Behind that is the cerebellum with the lobes of the

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vermis lying below the tentorium cerebelli.

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And there's the straight sinus and vein of Galen.

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Now, just above that, if we scroll a little bit,

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we've got the occipital lobe responsible for vision

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with the calcarine sulcus, separating the occipital lobe

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from the rest of the brain, including the cuneus

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and the precuneus, is the parietal occipital sulcus.

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So this is the boundary between the occipital

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lobe and the parietal lobe.

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Now, let's go out a little bit to the side

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for some just very gross anatomy.

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Looking at the frontal operculum and the temporal

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operculum and the Sylvian fissure,

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which is shaped a little bit like a caterpillar,

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and it separates the frontal lobe from the temporal lobe.

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Now, there are some very specific areas

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of anatomy that we'll talk about,

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including Broca's area, in a separate vignette

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in the anterior frontal lobe.

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The separation of the frontal lobe from the parietal

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lobe falls to the central sulcus of Rolando.

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So, here's the precentral sulcus.

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I'm going to show you in a few more vignettes how

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to identify it. There is the central sulcus.

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Here's the precentral gyrus,

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which is bigger than the postcentral gyrus,

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so the central sulcus.

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Now, we follow it off to the midline.

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There it is.

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There it is.

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It's a little hard to see in the midline.

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It has more of an oblique configuration to it.

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So we kind of lost it a little bit.

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It's right there, actually.

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That will separate the frontal

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lobe from the parietal lobe.

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You can see there's a lot less parietal lobe

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right here than there is off to the side.

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If we go back off to the side,

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there's a lot more parietal lobe.

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Let's go back to the central sulcus of Rolando.

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It's right there.

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So this would be frontal,

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this would be parietal, this would be occipital,

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and this would be temporal.

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Now, one other thing you should be aware of

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is that these sulci,

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they don't go straight up and down.

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They're oblique.

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So, depending upon where you are from top to bottom

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or how you angle,

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you know if you angle this way,

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things are going to look different than

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if you angle like a CT this way.

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And we'll talk about those differentiators and how to

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identify specific anatomy based on those varied

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angulations in a separate vignette.

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So, we've given you a rough idea of the brainstem,

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the cerebellum, the occipital lobe, the parietal lobe,

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the temporal lobe and the frontal lobe, and given

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you the means to distinguish their locales.

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Let's move on, shall we?