part_of part of part of specific_to embryo organ extraembryonic organ Planarian_Anatomy Organ that is associated with an embryo and derived from the zygote from which it develops, but which does not contribute to the embryo proper or to structures that are part of the same organism after embryogenesis. https://orcid.org/0000-0003-2569-1939 | https://orcid.org/0000-0002-7535-4582