Abductor Pollicis Longus (APL) Anatomy
- Origin: Middle third of the posterior surfaces of the ulna and radius and the interosseous membrane
- Insertion: Base of the first metacarpal bone of the thumb
- Innervation: Posterior interosseous nerve
- Nerve: Radial nerve (via posterior interosseous nerve branch)
Diagrams & Photos
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Abductor Pollicis Longus (APL)
Key Points
- Abductor Pollicis Longus (APL) typically has 2 to 7 slips.
- The multiple slips are frequently seen when opening the first dorsal extensor compartment during surgical release of the compartment for DeQuervain's tenosynovitis.