In the development of vertebrate animals, the pharyngeal arches (also called<unk> es or gill arches in fish) develop during the fourth and fifth week in utero as a series of mesodermal outpouchings on the left and right sides of the developing pharynx. In fish, the<unk> es give rise to gills.
Branchial arch
First pharyngeal arch
Branchial pouch
Dental alveolus
Hard palate
Pharyngeal recess
Aortic arches
Thyroglossal duct