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Medical Term:

aortic sac


Definition: in mammalian embryos, the endothelially lined dilation just distal to the truncus arteriosus; it is the primordial vascular channel from which the aortic arches (arteries) arise and is homologous to the ventral aorta of gill-bearing vertebrates.

© Copyright 2016 Wolters Kluwer. All Rights Reserved. Review Date: Sep 19, 2016.