The Probert Encyclopaedia of Medicine

LUMBRICALS

The lumbricals (lumbricales manus) consist of four small, fleshy tissues that originate from the tendons of the deep flexor muscle, the flexor digitorum profundus and insert in the extensor tendon of each of the four fingers. The lumbricals are innervated by the radial and ulnar nerves and supplied by the palmar arch from the deep metacarpal artery. These muscles work to flex and extend the fingers. The first lumbrical moves the index finger, the second moves the middle finger, the third moves the middle and ring finger and the fourth moves the ring and little finger.
Research Lumbricals