Embryology of Pharyngeal Arches
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Explanation:
The pharyngeal arches are out pouchings of tissue visible on the external neck of the embryo. They are separated by the pharyngeal clefts (each one caudal to its arch). The pharyngeal pouches are the out pouchings of the pharynx visible inside the embryo that correspond to the arches. The defect described is due to abnormal 
development of the derivatives of the first pharyngeal arch. It is thought that the initial defect may be insufficient migration of neural crest cells. Tags:
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