ARTERIAL SUPPLY & VENOUS DRAINAGE OF LUNG

ARTERIAL SUPPLY & VENOUS DRAINAGE OF LUNG 

Arterial supply of lung:

1. Bronchial arteries

• Right bronchial artery- (1 in number)- is a branch of the 3rd posterior intercostal artery or upper left bronchial artery
• Left bronchial artery- (2 in number)- are branches of the descending thoracic aorta: the upper one arises opposite T5 and the lower one just below the left bronchus.
• Bronchial arteries supply the lung till the beginning of respiratory bronchiole (conducting part) & then anastomose with pulmonary arteries.

2. Pulmonary arteries

• They carry deoxygenated blood from the right side of the heart to the alveoli for oxygenation.
• Supply respiratory part of the bronchial tree via pulmonary capillary plexus. 

Venous Drainage of lung:

1. Bronchial veins

• Superficial bronchial veins drain pleura & extrapulmonary bronchi.
• On the right side they drain into the azygous vein & on the left side they drain into the left superior intercostal vein or hemizygous vein.
• Deep bronchial veins drain rest of the bronchial tree & the lung parenchyma & end in pulmonary veins.

2. Pulmonary veins- (4 in number)- Open into the left atrium of the heart. 

Relations of Mediastinal Surface of Lungs

 

 

STRUCTURES RELATED TO MEDIASTINAL SURFACE OF THE RIGT & LEFT LUNG
RIGHT SIDE	LEFT SIDE
1. Right atrium & auricle	1. Left ventricle, left auricle,                 infundibulum & adjoining part of           the right ventricle.
2. A small part of right ventricle	2. Pulmonary trunk
3. Superior vena cava	3.  Arch of aorta
4. Lower part of the right                        brachiocephalic vein	4. Descending thoracic aorta
5. Azygous vein	5. Left subclavian artery
6. Oesophagus	6. Thoracic duct
7. Inferior vena cava	7. Oesophagus
8. Trachea	8. Left brachiocephalic vein
9. Right vagus nerve	9. Left vagus nerve
10. Right phrenic nerve	10. Left phrenic nerve
	11. Left  recurrent laryngeal                    nerve

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