Left main bronchus

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Left main bronchus
Illu conducting passages.jpg
Conducting passages.
Gray961.png
Front view of cartilages of larynx, trachea, and bronchi.
Latin bronchus principalis sinister
Gray's subject #237 1085
Dorlands/Elsevier b_23/12198348

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]

Overview

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.

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This article was originally based on an entry from a public domain edition of Gray's Anatomy. As such, some of the information contained herein may be outdated. Please edit the article if this is the case, and feel free to remove this notice when it is no longer relevant.



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