Flexor pollicis longus muscle

Flexor pollicis longus muscle
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.