A cadaver, also known as a corpse, is a dead human body. Cadavers are used by medical students, physicians, and other scientists to study anatomy, identify disease sites, determine causes of death, and provide tissue to repair a defect in a living human being. They can also be observed for their stages of decomposition, which can help determine how long a body has been dead. Cadavers have been used in art to depict the human body in paintings and drawings more accurately. The term cadaver is used in courts of law to refer to a dead body, as well as by recovery teams searching for bodies in natural disasters. The word comes from the Latin word cadere, which means "to fall". Related terms include cadaverous, which means resembling a cadaver, and cadaveric spasm, which is a muscle spasm causing a dead body to twitch or jerk. A cadaver graft, also called a postmortem graft, is the grafting of tissue from a dead body onto a living human to repair a defect or disfigurement.