Microsurgery is surgery in which some type of magnification instrument is used. Usually, this is done with the help of a microscope and specialized instruments. In the area of Plastic Surgery, Reconstructive Microsurgery is responsible for all those reconstructions in which microsurgery is necessary in any of its forms. The magnification allows to carefully dissect tissue units (flaps), blood vessels, nerves, lymph vessels, etc. It also allows its reconnection, making it possible to transplant tissue from one place to another distant. The microsurgical reconstruction is a high precision surgery, which can have different objectives depending on the defect to be repaired and whose development allows today to treat diseases that were previously considered intractable or incurable.