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Related to arterial arch: pharyngeal arch arteries
arterial archblood vessels which link the lateral dorsal AORTA with the ventral aorta. Six arches are present in vertebrate embryos and numbers 4–6 remain to serve the gills in fish. In higher vertebrates, numbers 3,4 and 6 remain as the carotid, systemic and pulmonary arches.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005