Extensor carpi ulnaris

Extensor carpis ulnaris (ECU) is a muscle of the superficial layer of the posterior compartment of the forearm. It is separated from the extensor digitorum and the extensor digiti minimi muscles by a distinct intermuscular septum. It is the only forearm extensor that lies in its own fibro-osseous tunnel at the level of the wrist as it passes through the 6th extensor compartment of the wrist.


Anatomy: Upper limb
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Article information

rID: 39872
Section: Anatomy
Tag: refs, cases
Synonyms or Alternate Spellings:
  • Extensor carpis ulnaris (ECU)
  • Extensor carpis ulnaris muscle

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Cases and figures

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    Figure 1: extensor compartments of the wrist
    Drag here to reorder.
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