![](/drem/stage9/labels2/S39L.gif)
![head mesenchyme, isthmus of rhombencephalon, junction of mesencephalon and rhombencephalon, neural fold, presumptive left atrium, surface ectoderm](/drem/stage9/Z0/S39N.jpg)
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Carnegie Embryo #3709 | Location: 01-04-05
Keywords: head mesenchyme, isthmus of rhombencephalon, junction of mesencephalon and rhombencephalon, neural fold, presumptive left atrium, surface ectoderm
Source: The Virtual Human Embryo.