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Flexor pollicis longus

Contents

Anatomy pictures

 

Flexor pollicis longus - anterior view
Flexor pollicis longus - anteromedial view

Referred pain pattern

Muscle type

  • Postural
    • Shortens when overactivated

Symptoms

  • Difficulties with fine motoric skills requiring use of the thumb, such as writing
  • Trigger thumb

Muscle attachment zones

 

Flexor pollicis longus - anterior view
Flexor pollicis longus - anteromedial view
Flexor pollicis longus - hand

Anatomy

Position

  • Deep

Origin

  • Anterior surface of proximal radius (just distal to tuberositas radii)
  • Membrana interosseus
  • Processus cornoideus ulnae
  • Medial eponcidylus humerus

Insertion

  • Anterior surface of distal phalanx of thumb

Main function

  • CMC joint
    • Flexion
  • MCP joint
    • Flexion
  • IP joint
    • Flexion
  • Wrist
    • Flexion

Secondary function

  • Wrist
    • Radial deviation
  • Elbow
    • Flexion

Nerve innervation

  • Segmental
    • C7-Th1
  • Peripheral
    • Nervus medianus

Arterial supply

  • Radial artery
  • Anterior interosseus artery