Muscles / Forearms
Flexor pollicis longus
- Forearms
- Forearm & wrist
- Deep layer
Also called FPL.
Anatomy
- Origin
- Anterior surface of the radius and adjacent interosseous membrane
- Insertion
- Base of the distal phalanx of the thumb
- Nerve
- Anterior interosseous nerve (median) (C8-T1)
Actions
- Flexes the phalanges of the thumb
Notes
- Anterior interosseous nerve palsy abolishes the "OK sign" (FPL and FDP to the index).
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