Triangular Fibrocartilage: Micrograph View
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Coronal photomicrograph of the triangular
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fibrocartilage emphasizing boundary attachments.
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The radial attachment is not
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directly to this cortex right here.
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It's actually to a not very well
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seen layer of hyaline cartilage.
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Underneath the triangular fibrocartilage is a
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space, the capsule, or the synovial reflection,
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and sometimes that may be a little thickened
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or even filled with a little bit of fluid.
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Our triangular fibrocartilage then continues
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on peripherally, and along the outer aspect
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of the triangle, if we're looking at the TFC
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from the top down, it's right at the periphery
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over here, which would correspond to over here.
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The TFC has a little kink or fold,
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and that fold heads into the fovea.
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That fold, along with the accompanying
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vasculature, which enters into it, is
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known as the deep layer of the peripheral
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attachment or the ligamentum subcruentum.
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We have some more superficial and distal
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attachments we'll show you in a few moments.
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As we move peripherally towards the ulnar
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styloid, which is a terrific landmark,
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we see the meniscus homolog, which is a
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filler substance surrounded by fibroelastic
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tissue of the capsule, sometimes condensed.
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As a linear structure that you can separate
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from the rest of the tissues is the ulnar
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collateral ligament, but not always.
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Next to it is the extensor carpi ulnaris
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subsheath, which is this lighter layer right here.
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So we have extensor carpi ulnaris, subsheath,
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capsule, homolog, TFC, superficial and
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deep layers of the peripheral attachment.
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The attachment to the radius, and we've already
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discussed, in a separate vignette, the ulnar carpal
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attachments and the palmar and dorsal distribution.
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Let's have a look at some MRIs, if you've got the time.
Stephen J Pomeranz, MD
Chief Medical Officer, ProScan Imaging. Founder, MRI Online
ProScan Imaging
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