Flexor Pollicis Longus (FPL)

Authors

Affiliations

Nathaniel Yomogida, B.S., SPT

Doctor of Physical Therapy

B.S. in Kinesiology

Chloë Kerstein, B.S., SPT

Doctor of Physical Therapy

B.A. in Neuroscience

Muscle	Origin	Insertion	Innervation	Action
Flexor pollicis longus

Origin

• Anterior/proximal Radius¹
• Adjacent IO membrane¹

Insertion

Distal phalanx of thumb (palmar surface)¹

Innervation

Anterior Interosseous N. (C8, T1)¹

Action

• Wrist: Flexion, Radial deviation¹
• CMC: Flexion¹
• 1st MCP/IP: Flexion¹

Notes

1.

Gilroy AM, MacPherson BR, Wikenheiser JC, Voll MM, Wesker K, Schünke M, eds. Atlas of Anatomy. 4th ed. Thieme; 2020.