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Flexor Digitorum Profundus
Origin: ulna & interosseous membrane
Insertion: palmar base of distal phalanges of four fingers
Action: flexion of distal interphalangeal joints of fingers
Innervation: median nerve (lateral half of muscle associated with fingers 1 & 2), ulnar nerve (medial half of muscles associated with fingers 3 & 4)
Flexor Pollicis Longus
Origin: radius and interosseous membrane, lateral to fix dig profundus muscle
Insertion: distal phalanx of thumb
Action: flexion of thumb
Innervation: median nerve
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