aortic arches

Type: Term Definitions: 1. a series of arterial channels encircling the embryonic pharynx in the mesenchyme of the pharyngeal arches. There are potentially six pairs, but in mammals the fifth pair is poorly developed or absent. The first and second pairs are functional only in very young embryos; the third pair is involved in the formation of the c...
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Aortic arches

The aortic arches or pharyngeal arch arteries (once referred to as branchial arches in human embryos) are a series of six paired embryological vascular structures which give rise to several major arteries. They are ventral to the dorsal aorta and arise from the aortic sac. ==Specific arches== ===Arches 1 and 2=== The first and second arches disapp...
Found on http://en.wikipedia.org/wiki/Aortic_arches
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