Pulmonary artery

Artery: Pulmonary artery
	Anterior (frontal) view of the opened heart. White arrows indicate normal blood flow. (Pulmonary artery labeled at upper right.)
	Diagram of the alveoli with both cross-section and external view
Latin	truncus pulmonalis, arteria pulmonalis
Gray's	subject #141 543
Source	right ventricle
Vein	pulmonary veins
Precursor	truncus arteriosus
MeSH	Pulmonary+Artery

The pulmonary artery carries deoxygenated blood from the heart to the lungs. It is one of the only arteries (other than the umbilical arteries in the fetus) that carry deoxygenated blood.

In the human heart, the pulmonary trunk (pulmonary artery or main pulmonary artery) begins at the base of the right ventricle. It is short and wide—approximately 5 centimetres (2.0 in) in length and 3 centimetres (1.2 in) in diameter. It then branches into two pulmonary arteries (left and right), which deliver de-oxygenated blood to the corresponding lung.

In contrast to the pulmonary arteries, the bronchial arteries supply nutrition to the lungs themselves.

Role in disease [edit]

Pulmonary hypertension occurs alone and as a consequence of a number of lung diseases. It can also be a consequence of heart disease (Eisenmenger's syndrome) but equally a cause (right-ventricular heart failure); it also occurs as a consequence of pulmonary embolism and scleroderma. It is characterised by reduced exercise tolerance. Severe forms, generally, have a dismal prognosis.

Additional images [edit]

Fetal pulmonary artery
Bronchial anatomy
Image showing main pulmonary artery coursing ventrally to the aortic root and trachea, and the right pulmonary artery passes dorsally to the ascending aorta, while the left pulmonary artery passes ventrally to the descending aorta.

Bronchi, bronchial tree, and lungs
Pulmonary circuit
Alveolus diagram

Anatomy of lungs.
Front view of heart and lungs.
Transverse section of thorax, showing relations of pulmonary artery.

Base and diaphragmatic surface of heart.
The position and relation of the esophagus in the cervical region and in the posterior mediastinum. Seen from behind.Crystal.
Pulmonary artery
Pulmonary trunk
Pulmonary artery
Pulmonary artery
Pulmonary trunk
Pulmonary artery
Pulmonary artery