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.
Stephen J Pomeranz, MD
Chief Medical Officer, ProScan Imaging. Founder, MRI Online
ProScan Imaging
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