Flexor carpi radialis

Dr Sachintha Hapugoda and Dr Henry Knipe et al.

Flexor carpi radialis (FCR) is a muscle found in the first layer of the anterior compartment of the forearm. It does not pass through the carpal tunnel, but rather by itself in a small separate tunnel between the superficial and deep layers of the flexor retinaculum along the scaphoid and trapezium.


  • origin: medial epicondyle of the humerus, antebrachial fascia
  • insertion: base of the 2nd and 3rd metacarpals, small slip to trapezial tuberosity
  • innervation: median nerve (C6-7)
  • action: flexion and extension of the wrist joint
Upper limb anatomy
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Article information

rID: 23239
Section: Anatomy
Synonyms or Alternate Spellings:
  • Flexor carpi radialis muscle
  • FCR

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Cases and figures

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    Case 1: x-ray
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    Case 1: ultrasound
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    Figure 1: carpal tunnel diagram
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