![](/drem/stage12/labels2/S123L.gif)
![aortic sac, dermatomyotome 2 (O-2) , dorsal aorta, notochord, pericardial cavity, pharyngeal pouch 3, pharynx, rhombencephalon (Rh. D)](/drem/stage12/Z0/S123N.jpg)
![](/drem/rulerbg.png)
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Carnegie Embryo #8943 | Location: 03-04-01
Keywords: aortic sac, dermatomyotome 2 (O-2) , dorsal aorta, notochord, pericardial cavity, pharyngeal pouch 3, pharynx, rhombencephalon (Rh. D)
Source: The Virtual Human Embryo.