4.2.3
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Extensor pollicis longus Insertion
Dorsal surfaces of the distal phalanges of the 2nd to 5th digits
Extensor pollicis longus Origin
Dorsal ulna about a third of the way down from elbow (near membrane between the bones)
Flexor pollicis longus Origin
anterior surface of radius and interosseous membrane
Flexor pollicis longus Insertion
base of distal phalanx of thumb
extensor pollicis longus action
extends distal phalanx of thumb
flexor pollicis longus action
flexes distal phalanx of thumb
