Opening of the pulmonary artery
Encyclopedia
The opening of the pulmonary artery
Pulmonary artery
The pulmonary arteries carry deoxygenated blood from the heart to the lungs. They are the only arteries that carry deoxygenated blood....

(or trunk) is circular in form, and situated at the summit of the conus arteriosus
Conus arteriosus
The conus arteriosus is a conical pouch formed from the upper and left angle of the right ventricle in the chordate heart, from which the pulmonary trunk arises....

, close to the ventricular septum.

It is placed above and to the left of the atrioventricular opening
Atrioventricular opening
Atrioventricular opening can refer to:* Right atrioventricular opening* Left atrioventricular opening...

, and is guarded by the pulmonary semilunar valves.
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