Flexor Pollicis Longus

Flexor Pollicis Longus

The word pollicis refers to the thumb and so the flexor pollicis longus is the long muscle which flexes the thumb!

  • Origin – Middle anterior surface of the radius.  
  • Insertion – Base of the distal phalanx of the thumb.  
  • Actions – Flexion of the thumb.
    Flexion of the wrist.
  • Innervation – Anterior interosseous nerve.  
  • Daily uses – Gripping something tightly.
  • Example strengthening exercises – Wrist flexion using a dumbbell.
  • Example stretches – Wrist flexor stretch.  
  • Related muscles – Extensor pollicis longus. Flexor digitorum superficialis.
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