Flexor carpi ulnaris

Dr Yair Glick and Dr Henry Knipe et al.

Flexor carpi ulnaris (FCU) is a muscle of the first layer of the anterior compartment of the forearm.


  • origin
    • humeral head: medial epicondyle of the humerus
    • ulnar head: medial border of olecranon and posterior border of ulna
  • insertion: base of 5th metacarpal; hook of hamate, pisiform
  • innervationulnar nerve (C8-T1)
  • action: flexion and abduction of the wrist joint
  • pathology: calcific tendinitis which occurs at the insertion into pisiform
Upper limb anatomy
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Article information

rID: 23257
Section: Anatomy
Synonyms or Alternate Spellings:
  • FCU
  • Flexor carpi ulnaris muscle

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