three vessels and trachea

(a and b) A composite of echocardiogram (a) and histological section (b) illustrating a section of the three vessels and trachea (fifth plane). The PT is seen in continuity with the arterial duct. The aorta is in the middle, with the superior vena caval vein to its right side. Behind the caval vein, we see the trachea, and even further posteriorly the esophagus. The arterial duct and the aortic isthmus merge into a “V”. Ao: Aorta, E: Esophagus, PT: Pulmonary trunk, RV: Right ventricle, SCV: Superior caval vein, T: Trachea