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C-2 dermatome, C-3 dermatome, C-3 neural crest, conus cordis, edge of optic stalk, esophageal part, left atrium, mesocardium, mesoesophagus, ostium primum, postcardinal vein, precardinal vein, preoptic area, prosencephalon (telencephalic part), prosocoele (forebrain ventricle), right atrium, sinu-atrial orifice, sinus venosus, tracheal part

A section through the middle of the C-3 neural crest, telencephalic part of the prosencephalon and cranial part of the sinus venosus.

Observe:
1. The dorsal position of the sinus venosus to the right atrium.
2. The ventral position of the tracheal part of the tracheoesophageal tube to the esophageal part.
3. The pre- and postcardinal veins near their junction to form the common cardinal vein.


Keywords: C-2 dermatome, C-3 dermatome, C-3 neural crest, conus cordis, edge of optic stalk, esophageal part, left atrium, mesocardium, mesoesophagus, ostium primum, postcardinal vein, precardinal vein, preoptic area, prosencephalon (telencephalic part), prosocoele (forebrain ventricle), right atrium, sinu-atrial orifice, sinus venosus, tracheal part

Source: Atlas of Human Embryos.