Flexor pollicis longus muscle
Flexor pollicis longus muscle |
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origin |
Front of the spoke , interosseous membrane |
approach |
Terminal phalanx of the thumb |
function |
Flexors of the thumb and wrist |
Innervation |
Median nerve from the brachial plexus |
Spinal segments |
C7, C8 |
The flexor pollicis longus muscle ( Latin for "long thumb flexor ") is a skeletal muscle and one of the deep flexors on the forearm . Its tendon runs through the carpal tunnel (Canalis carpi). The flexor pollicis longus muscle bends the thumb to the extremity and the hand in the wrist .
Varieties
In about 30% of the cases, the muscle has an additional origin at the epicondylus medialis humeri, which is referred to as the caput humerale (“humerus head”).
The flexor pollicis longus muscle is a split off the flexor digitorum profundus muscle . In some cases, the flexor pollicis longus tendon radiates into the flexor digitorum profundus tendon, which leads to a disturbing flexion of the index finger when the thumb is flexed.