Lumbrical muscles of hand

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Description:

Origin:
First lumbrical from the radial side of the flexor digitorum profundus tendon of the index finger, second lumbrical from the radial side of the flexor digitorum profundus tendon of the middle finger, third lumbrical from the ulnar side of the flexor digitorum profundus tendon of the middle finger and the radial side of the flexor digitorum profundus tendon of the ring finger, fourth lumbrical from the ulnar side of the flexor digitorum profundus tendon of the ring finger and the radial side of the flexor digitorum profundus tendon of the little finger

Insertion:
Radial side of extensor expansion of digits 2,3,4,5

Actions:
Flexes metacarpo-phalangeal joint and extends interphalangeal joints

Nerve supply:
Median nerve to first and second lumbricals; Ulnar nerve to third and fourth lumbricals

Blood supply:
Branches of the radial and ulnar arteries