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Middle Frontal Gyrus

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I want to talk a little bit about

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the middle frontal gyrus,

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which serves as a nice landmark to identify

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the precentral sulcus.

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Let's start out down low in the frontal region.

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We've got the letter M, the pars orbitalis,

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the pars triangularis, and then the pars opercularis.

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Now, let's take that away.

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That's the inferior frontal gyrus.

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Let's scroll a little bit more towards the midline.

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Right above this sulcus,

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the inferior frontal sulcus is the middle frontal gyrus.

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Now, the middle frontal gyrus can be divided up into two.

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It's the thickest of the frontal gyrus.

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Sometimes there's an extra sulcus running right through it.

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We don't see that here right now,

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but it does point to a space,

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and then that space gives rise to a sulcus,

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the precentral sulcus.

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For right now,

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pay no attention to this horizontal sulcus right here.

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So immediately behind that would be the precentral gyrus,

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bigger than the postcentral gyrus.

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And now you have your central sulcus of Rolando.

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So, that's one way to get to the central sulcus.

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Now, the central sulcus of Rolando does not

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communicate with the Sylvian fissure.

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This area right below it is called the subcentral gyrus.

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In the next vignette,

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I want to come back to and have a

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brief separate review of the intraparietal

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sulcus and the inferior parietal lobule.

Report

Description

Faculty

Stephen J Pomeranz, MD

Chief Medical Officer, ProScan Imaging. Founder, MRI Online

ProScan Imaging

Tags

Neuroradiology

MRI

Brain

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