imaginal disc https://github.com/FlyBase/drosophila-anatomy-developmental-ontology/issues/320 fly_anatomy.ontology A sac shaped epithelial structure in the larva that gives rise to part of the adult integumentary system. One side of the sac consists of peripodial epithelium, the other of columnar epithelium. A single anterior-posterior compartment boundary bisects both peripodial membrane and columnar epithelium. Cells do not cross this boundary during growth and development of the disc. UBERON:0000939 imaginal disk FBbt:00001761 Drosophila embryonic structure