![](/drem/stage20/labels2/S225L.gif)
![T-1 spinal ganglion, aorta, ascending aorta, blood cells in left atrium, cardiac prominence, esophagus, head of rib 2, intermediate zone, marginal zone, musculi pectinati in wall of left auricle, musculi pectinati in wall of right auricle, pericardial cavity, phrenic nerve, pulmonary semilunar valve, pulmonary trunk, superior vena cava, sympathetic ganglion, trachea, ulna, ulnar nerve, ventricular zone](/drem/stage20/Z0/S225N.jpg)
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Carnegie Embryo #462 | Location: 5-04-03
Keywords: T-1 spinal ganglion, aorta, ascending aorta, blood cells in left atrium, cardiac prominence, esophagus, head of rib 2, intermediate zone, marginal zone, musculi pectinati in wall of left auricle, musculi pectinati in wall of right auricle, pericardial cavity, phrenic nerve, pulmonary semilunar valve, pulmonary trunk, superior vena cava, sympathetic ganglion, trachea, ulna, ulnar nerve, ventricular zone
Source: The Virtual Human Embryo.