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Flexor Carpi Ulnaris
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| Flexor Carpi Ulnaris | |
|---|---|
| Muscle Type | |
| Origin | Humeral head origin is medial epicondyle from common flexor tendon. Ulnar head origin is medial aspect of the olecranon and proximal border of the ulna |
| Insertion | Pisiform bone, hamate bone, and base of the fifth metacarpal |
| Action | Wrist flexion, also ulnarly deviates the wrist/hand. |
| Synergists | |
| Antagonists | |
| Spinal innervation | C7, C8 |
| Peripheral Innervation | Ulnar Nerve |
| Vasculature | |
Palpation
Immediately proximal to the pisiform
Manual Muscle Testing
To isolate the flexor carpi ulnaris, examiners combine wrist flexion with ulnar deviation in a neutral or supinated arm position. This position biases the FCU’s line of pull and minimizes contribution from the flexor carpi radialis (which produces radial deviation). The patient’s forearm is usually supinated or in neutral, and the wrist is flexed toward the ulnar side against resistance. Palpation of the tendon proximal to the pisiform can help ensure FCU activation.
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