Flexor carpi ulnaris muscle

Radiopaedia • CC-by-nc-sa 3.0 • de

Flexor carpi ulnaris (FCU) muscle is of the first layer of the anterior compartment of the forearm. It is one of the extrinsic muscles of the hand.

Summary

  • origin
    • humeral head: medial epicondyle of the humerus
    • ulnar head: aponeurosis from medial olecranon and upper three quarters subcutaneous border of ulna
  • insertion: base of 5metacarpal; hook of hamate, pisiform
  • arterial supply: posterior ulnar recurrent artery and ulnar artery
  • innervation: ulnar nerve (C8-T1)
  • action: flexion and adduction of the wrist joint
  • pathology: calcific tendinitis which occurs at the insertion into pisiform
  • variability: muscle can be doubled - accessory flexor carpi ulnaris muscle, which can be often accompanied by concomitant variants