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. 2016 Sep 1;7(5):561–577. doi: 10.1177/2150135116651114

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© The Author(s) 2016

This article is distributed under the terms of the Creative Commons Attribution 3.0 License (http://www.creativecommons.org/licenses/by/3.0/) which permits any use, reproduction and distribution of the work without further permission provided the original work is attributed as specified on the SAGE and Open Access page (https://us.sagepub.com/en-us/nam/open-access-at-sage).

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Figure 2. — The images are from an episcopic data set prepared from a human embryo at Carnegie stage 14, representing the end of the fifth week of development. The left panel (A) shows the dog-leg bend in the outflow tract, which at this early stage is supported exclusively from the developing right ventricle. The right panel (B), cut in frontal fashion at the junction of the outflow tract with the pharyngeal mesenchyme, shows the origins of the pharyngeal arch arteries from the aortic sac. The back wall of the sac, shown by the star, is the putative aortopulmonary septum. The two single-headed arrows show the extent of the pericardial cavity.