Muscles / Forearms
Abductor pollicis longus
- Forearms
- Forearm & wrist
- Deep layer
Also called APL.
Anatomy
- Origin
- Posterior surfaces of the ulna, radius and interosseous membrane
- Insertion
- Base of the 1st metacarpal
- Nerve
- Posterior interosseous nerve (radial) (C7-C8)
Actions
- Abducts the thumb
- Extends the thumb at the carpometacarpal joint
Also trained by
Notes
- With EPB, forms the 1st dorsal compartment affected in De Quervain tenosynovitis.
References (4)
- Standring S, ed. Elsevier. Gray's Anatomy: The Anatomical Basis of Clinical Practice. 42nd ed.
- Dalley AF, Agur AMR. Wolters Kluwer. Moore's Clinically Oriented Anatomy. 9th ed.
- Neumann DA. Elsevier. Kinesiology of the Musculoskeletal System: Foundations for Rehabilitation. 3rd ed.
- Betts JG, Young KA, Wise JA, et al. OpenStax (free, openly licensed textbook). Anatomy and Physiology 2e