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
Traditional Chinese medicines derived from the human body placenta in the ground for 7 to 8 years, and it dissolves into a fluid that is as clean as ice. In south China, people blend human placenta with "gāncǎo" 甘草 ""Glycyrrhiza uralensis"; Chinese licorice root", "shēngmá" 升麻 ""Cimicifuga simplex"; bugbane", and other drugs, which they store in a bottle, and bury in the ground for 3 to 5 years. Then they dig it up and use it medicinally. The 52.24 "rénpò" 人魄 "Human ghost (of a hanged person)" medicine refers to Chinese hun and po soul dualism between the "hun" 魂 "spiritual, ethereal, yang soul" that leaves the body