Midline Sagittal Commissures
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Let's take a look at the sagittal midline cut,
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the guts, the heart and soul of MRI of the brain
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where you might use this sequence to evaluate,
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and especially this projection,
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to look for anomalies of the brain in pediatric patients.
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I want to talk about the commissures.
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So, I'm going to start out with the inferior colliculus,
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the superior colliculus.
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And I run right into the posterior commissure,
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which is a pretty small structure.
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And right above it is the habenular commissure,
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sitting between it, the posterior commissure,
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and the pineal gland, which is not a commissure.
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Another commissure is the interthalamic adhesion,
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which you can scroll back and forth,
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the midline portion of the thalamus.
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A well-known commissure,
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anteriorly, is the anterior commissure.
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And then the largest commissure,
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the granddaddy of them all,
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is the corpus callosum.
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And look in the midline,
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we see a vertical slit-like area of hyperintensity.
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Right there.
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The lamina terminalis and
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the rostrum of the corpus callosum,
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followed by genu body and the splenium of the corpus
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callosum, which you're all familiar with.
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And as long as we're in the neighborhood,
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we've got the body and crus of the fornix
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and then the fornix itself.
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We'll move on now to some of the other structures
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in the midline, if you have time.
Stephen J Pomeranz, MD
Chief Medical Officer, ProScan Imaging. Founder, MRI Online
ProScan Imaging
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