Parieto-occipital Sulcus
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Let's take a look at the parieto-occipital sulcus,
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which separates the occipital lobe from the parietal lobe.
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Here it is.
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It looks a little bit like the letter Y lying on its side.
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Here's our Y right here.
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And it merges with this calcarine sulcus
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to form the anterior calcarine sulcus.
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Now,
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the structure in front of it looks a little
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bit kind of like a tongue of beef.
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Right here.
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Right there,
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is the continuation of the cingulate sulcus.
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Now, let's take our arrows away for a minute
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or our lines away.
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We've got the occipital lobe and the cuneus.
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In front of that is the precuneus.
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And within the precuneus is something that
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looks a little bit like the letter H.
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There's our H.
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And this is the subparietal sulcus
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located in the precuneus.
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In front of the precuneus is the paracentral lobule.
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Within the paracentral lobule is the oblique perpendicular
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to the marginal sulcus, central sulcus of Rolando.
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This paracentral sulcus,
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which we discussed in another vignette,
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which comes up anteriorly,
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forms the anterior boundary of the paracentral lobule.
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All of this contributing to the frontal lobe until we get
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to the central sulcus of Rolando,
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which defines the parietal lobe posterior to it,
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which is a tough designation to make in the sagittal
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near the midline.
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So, frontal lobe, paracentral lobule,
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central sulcus of Rolando,
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a little bit of the parietal lobe,
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precuneus, subcentral sulcus,
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cuneus, occipital lobe,
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superior, inferior, calcarine sulcus,
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calcarine sulcus, merges with the parieto-occipital
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sulcus to form the anterior calcarine sulcus.
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And there's the beef tongue of the cingulate gyrus.
Stephen J Pomeranz, MD
Chief Medical Officer, ProScan Imaging. Founder, MRI Online
ProScan Imaging
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