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Opponens Pollicis
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| Opponens Pollicis | |
|---|---|
| Muscle Type | |
| Origin | Tuberosity of the trapezium and flexor retinaculum |
| Insertion | Entire lateral aspect of the shaft of the first metacarpal bone |
| Action | Thumb Opposition |
| Synergists | Abductor Pollicis Brevis, Flexor Pollicis Brevis |
| Antagonists | |
| Spinal innervation | C8, T1 |
| Peripheral Innervation | Median Nerve |
| Vasculature | |
Palpation
Deep to the abductor pollicis brevis along the lateral shaft of the first metacarpal
Manual Muscle Testing
The patient has their forearm in supination with wrist in neutral, thumb adducted, and MCP and IP joints in flexion. Resistance is applied at the head of the first metacarpal into lateral rotation, extension, and adduction to test the opponens pollicis and the palmar surface of the fifth metacarpal (trying to “flatten” the palm) for the opponens digiti minimi.
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