PETER MENZEL / SCIENCE PHOTO LIBRARY PETER MENZEL / SCIENCE PHOTO LIBRARY
Ranch owner adjusting the elbow joint of his "myoelectric" prosthetic arm. Locking the joint enables heavy weights (up to 50 pounds) to be lifted. This artificial right arm worn with a hand, is battery powered. Small electrodes placed on the skin at the site of amputation, sense the electrical activity of the remaining arm muscle. These muscle signals are electronically amplified and are used to move the prosthetic arm and hand as required. It gives the user fine control over the limb, and the ability to use the arm slowly or quickly, with precision and varying strength. The "myoelectric" arm was developed at the University of Utah, USA. Photograph of Bob Goodman.
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