Branchial anomaly 2009-02-11T05:16:20Z HP:0009794 Branchial anomalies Abnormality of branchial arch UMLS:C1862066 During embryonic development the major head and neck structures are formed from the five pharyngeal arches (bands of tissue). Incomplete, failed or persistent embryonic development of these arches results in several anomalies or defects in the neck. Branchial abnormality Abnormality of branchial apparatus Congenital developmental defect arising from the primitive branchial apparatus. Abnormal neck morphology