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Axial Anatomy: Extensor Tendons on MRI

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Let's turn our attention to the extensors,

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the dorsal aspect of the wrist, the posterior

0:10

aspect of the wrist, and try and match up some

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of the anatomy you heard in our animation.

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We start out with compartment number 1, then

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2, then 3, then 4, then 5, and here's 6.

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That's a little quick.

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Compartment number 1, the abductor

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pollicis longus, extensor pollicis brevis.

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There are innumerable slips.

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Look at these small little slits right

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here in the abductor pollicis longus.

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If this was inflamed, those slits, like

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this one right here, might widen and might

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be confused with a longitudinal tear.

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An important pitfall.

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Then we go from the abductor compartment number

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one, to extensor carpi radialis longus and brevis.

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So it goes longus, brevis, longus, brevis.

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Now we've got to find the EPL.

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Where did it go?

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Well, let's go to Lister's tubercle.

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There is the extensor pollicis longus.

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There's Lister's tubercle.

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Well, now we can try and track

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the extensor pollicis longus.

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Although, we're going to need some

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long axis projections to help us.

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That's compartment number three.

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Compartment number four, the extensor

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digitorum communis and indices, is a larger

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compartment in which one or more tendons

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may be involved in a disease process.

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Then we go to the extensor digiti minimi.

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Compartment number five, this is four, this is five.

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And finally, to the extensor carpi ulnaris

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which sits in the ulnar groove, but as stated

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previously, may perch either to the radial

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side or to the ulnar side depending upon

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the degree of pronation and/or supination.

2:02

But we see there's nothing other than

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simple lubricant around this ECU.

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There's no indirect sign of an inflammatory

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reaction either in the tendon or around the tendon.

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Helping us decide whether the position is correct

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of the extensor carpi ulnaris is physiologic or not.

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We're going to get into the relationship of

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the ECU and its subsheath right here and

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the adjacent structures of the TFC and the

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homo-lateral capsule in a separate discussion.

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The extensor, dorsal, posterior compartment

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highlighting the tendons of the wrist.

Report

Faculty

Stephen J Pomeranz, MD

Chief Medical Officer, ProScan Imaging. Founder, MRI Online

ProScan Imaging

Tags

Musculoskeletal (MSK)

MRI

Idiopathic

Hand & Wrist

Congenital

Acquired/Developmental

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