Extensor Pollicis Longus
From WikiMSK
| |
| Extensor Pollicis Longus | |
|---|---|
| Muscle Type | |
| Origin | Middle 1/3 of the posterior surface of the ulna distal to the origin of the abductor pollicis longus, and to the interosseous membrane |
| Insertion | Base of distal phalanx of the thumb, dorsal surface |
| Action | IPJ extension, assist in MCPJ an CMCJ extension, assist in wrist abduction/extension |
| Synergists | |
| Antagonists | |
| Spinal innervation | C7, C8, T1 |
| Peripheral Innervation | Posterior Interosseous Nerve |
| Vasculature | |
The extensor pollicis longus muscle (EPL) is a skeletal muscle located dorsally on the forearm. It is much larger than the extensor pollicis brevis, the origin of which it partly covers and acts to stretch the thumb together with this muscle.
Manual Muscle Testing
EPL
Patient: Sitting or supine
Fixation: Stabilisation of the hand, and give counterpressure against palmar surface of 1st MC and proximal phalanx.
Test: thumb IPJ extension
Pressure: Applied against dorsal IPJ of thumb into flexion.
