Anatomy - Flexor pollicis longus muscle
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Flexor pollicis longus - Insertion
Base of the distal phalanx of the thumb (palmer surface)
Flexor pollicis longus - Action
Flexion of the thumb carpometacarpal, metacarpophalangeal, and interphalangeal joints, Flexion of the wrist, Abduction of the wrist
Flexor pollicis longus - Innervation
Median nerve, palmar interosseous branch (C8, T1)
Flexor pollicis longus - Origin
Middle anterior surface of the radius and the anterior medial border of the ulna just distal to the coronoid process; occasionally a small head is present attaching on the medial epicondyle of the humerus