Regarding fetal circulation,the small vessel connecting the pulmonary artery with the descending thoracic aorta is called the:

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The vessel connecting the pulmonary artery with the descending thoracic aorta is called the ductus arteriosus. This shunts blood away from the lungs in fetal circulation, as the lungs are not yet functional and the fetus receives oxygen from the placenta. After birth, the ductus arteriosus normally closes and becomes the ligamentum arteriosum, allowing blood to flow freely to the lungs for oxygenation.

Regarding Fetal Circulation,the Small Vessel Connecting the Pulmonary Artery with the Descending