brachial plexus: a network of nerves formed by cervical and thoracic spinal nerves and supplying the arm and parts of the shoulder
nerve plexus: a network of intersecting nerves
radiation sickness: syndrome resulting from exposure to ionizing radiation (e.g., exposure to radioactive chemicals or to nuclear explosions); low doses cause diarrhea and nausea and vomiting and sometimes loss of hair; greater exposure can cause sterility and cataracts and some forms of cancer and other diseases; severe exposure can cause death within hours