| Title | Individual Muscles of Forearm 6 |
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| Clinical | Clinical: This muscle is tested clinically by asking the patient to flex the tip of the thumb against resistance while the physician holds the proximal phalanx fixed between his/her thumb and fingers. This action not only tests the strength of muscle contraction but also tests the integrity of the median nerve, which innervates this muscle. |
| Comment | Comment: The tendon of this unipennate muscle belly crosses the carpal canal on the lateral or radial side of the digital flexor tendons and passes to the distal phalanx of the thumb. The tendon has its own synovial sheath. |
| Origin | Origin (proximal): Anterior aspect of the radius and adjacent interosseous membrane. |
| Insertion | Insertion (distal): Base of the distal phalanx of the thumb. |
| Attachments | |
| Innervation | Innervation: Median nerve (anterior interosseous branch) (C7, C8, and T1). |
| Actions | Action: The primary action is flexion of the distal phalanx of the thumb. The muscle also can flex the proximal phalanx because its tendon crosses that joint. |
| Plate | Atlas Plate 431 |
| 1a | Flexor pollicis longus;Musculus flexor pollicis longus |
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| Tags | Dope::Anatomy::Upper_Limb |