Supernumerary body part considered to have lost much or all of their original function through evolution. These body parts can be classed as additional to the required functioning of the body. In human anatomy the vermiform appendix is sometimes classed as a vestigial remnant. Prosthesis is an artificial extension that replaces a body part, and cybernetics is the study of computer technology in relation to organisms which can include replacement or additional body parts. Body integrity identity disorder (BIID) is a psychiatric disorder in which a person thinks that they have one or more additional limbs than they should, despite having two arms
Convention for the Protection of Human Rights and Dignity of the Human Being with regard to the Application of Biology and Medicine availability of organs from a deceased person. Any removed parts of the body must be disposed of respectfully in accordance with the wishes of the individual. In addition, there is to be no financial gain arising from the human body or its parts, however adequate compensation for expenses incurred for a medical procedure is not prohibited. The rules relating to consent laid out in "Chapter II" of the Convention also apply in the context of organ transplantation. In accordance with the European Convention on Human Rights, any individual who has suffered damage should have access to fair compensation ("Article 24").