The dilated structure that is lined by endothelial cells and located at the arterial pole of the heart just above (distal to) the truncus arteriosus in mammalian embryos; it is the primordial vascular channel from which the aortic arches (and eventually the dorsal aortae) arise; the aortic sac is homologous to the ventral aorta of gill-bearing vertebrates [ MP:0012510 ]
Synonyms: saccus aorticus
the merged ventral aortae of the embryo which supplies blood to the aortic arches[TMD][http://medical-dictionary.thefreedictionary.com/aortic+sac].
- heart blood vessel
- embryonic structure
- structure with developmental contribution from neural crest
- develops_from some pharyngeal arch artery
- part of some outflow tract