EVERYDAY SCIENCE

Detailed explanation-1: -The vessel is called the truncus arteriosus. It usually splits in two as the baby grows in the womb. One part becomes the lower end of the body’s main artery, called the aorta. The other part becomes the lower part of the pulmonary artery.

Detailed explanation-2: -Truncus arteriosus type 3: One pulmonary artery branches off the common trunk, and the other branches off the aorta. Truncus arteriosus type 4: Neither pulmonary artery branches off the main artery. Instead, they branch off the descending aorta (portion of the aorta that moves downward into the chest).

Detailed explanation-3: -Truncus arteriosus pronounced TRUNG-kus ahr-teer-e-O-sus), also known as common truncus, is a rare defect of the heart in which a single common blood vessel comes out of the heart, instead of the usual two vessels (the main pulmonary artery and aorta).

Detailed explanation-4: -A1-short main pulmonary artery segment arises from truncus then bifurcates into pulmonary arteries (same as Collett and Edwards type I) A2-pulmonary arteries arise separately from posterior truncus. A3-one pulmonary artery arises on the truncus and another is supplied by a duct. More items