has part has part characteristic of part of inheres in part of has modifier Abnormality of the urachus 2009-09-15T10:13:04Z UMLS:C4023811 Abnormality of the urachus. HP:0010478 The urachus is a vestigial embryonic structure, a canal that connects the urinary bladder of the fetus with the allantois (a structure involved in the development of the umbilical cord). During embryonic development, the lumen of the urachus is normally obliterated, transforming the urachus into a solid cord. Abnormal bladder morphology quality abnormal urachus