Left main bronchus

Left main bronchus

Infobox Anatomy
Name = PAGENAME
Latin = bronchus principalis sinister
GraySubject = 237
GrayPage = 1085


Caption = Conducting passages.


Caption2 = Front view of cartilages of larynx, trachea, and bronchi.
System =
MeshName =
MeshNumber =
DorlandsPre = b_23
DorlandsSuf = 12198348
The left main bronchus (or left primary bronchus, or left principal bronchus) is smaller in caliber but longer than the right, being nearly 5 cm long. It enters the root of the left lung opposite the sixth thoracic vertebra.

It passes beneath the aortic arch, crosses in front of the esophagus, the thoracic duct, and the descending aorta, and has the left pulmonary artery lying at first above, and then in front of it.

The left bronchus has no eparterial branch, and therefore it has been supposed by some that there is no upper lobe to the left lung, but that the so-called upper lobe corresponds to the middle lobe of the right lung.


=Additional

External links

*
* - "The divisions of the bronchus."


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