A scan of Susanna Leijten's upper chest showing the thymus The thymus was a gland located in the upper chest of a Human body. It played an important role in the Human immune system. The parasitic Tarchannen III species cells were located in the thymus after infecting a host, using the immune system to spread genetic instructions that would turn the host into a full member of the species. Doctor Beverly Crusher successfully removed the parasite from Susanna Leijten's and Geordi La Forge's thymuses after they were infected by the lifeform. (TNG: "Identity Crisis") External linkEdit Thymus at Wikipedia Retrieved from "https://memory-alpha.fandom.com/wiki/Thymus?oldid=2172485" Categories: Glands Add category Cancel Save Community content is available under CC-BY-NC unless otherwise noted.