Extensor Carpi Radialis Brevis
Extensor carpi radialis brevis (ECRB) is a short muscle emerging underneath the extensor carpi radialis longus and both muscles share a common tendinous synovial sheath. It is an extensor muscle located superficially at the posterior compartment of the forearm.
The main blood supply to ECRB is from the radial artery. Other augmentation are from the radial collateral branch from profunda brachii and the radial recurrent artery.
Lateral epicondylitis presents as pain on the lateral aspect of the elbow with or without loss of grip strength that is aggravated with activity and it will most likely have extensor carpi radialis brevis muscle affectation.
In cases of radial nerve compromise proximal to its division to deep and superficial branches at the cubital fossa, then some functional loss of wrist and digits extension will be present.
AssessmentWith the hand in pronation, the ECRB muscle can be palpated during extension and abduction of the wrist against resistance.
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- OTstudentVids. MMT of Flexor Carpi Radialis/Ulnaris and Extensor Carpi Uln. Available from: https://www.youtube.com/watch?v=31Wbe7xv8Jk [last accessed 29/3/2019]