Left main bronchus
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| Left main bronchus | |
|---|---|
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| Conducting passages. | |
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| Front view of cartilages of larynx, trachea, and bronchi. | |
| Latin | bronchus principalis sinister |
| Gray's | subject #237 1085 |
| Dorlands/Elsevier | b_23/12198348 |
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.
[edit] Additional images
 Anatomy of lungs. |
 The tracheobronchial lymph glands. |
 The position and relation of the esophagus in the cervical region and in the posterior mediastinum. Seen from behind. |
[edit] External links
- Dictionary at eMedicine left+main+bronchus
- SUNY Figs 19:08-02 - "The divisions of the bronchus."
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 As such, some of the information contained herein may be outdated.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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lungs: right, left, lingula, apex, base, root, cardiac notch, cardiac impression, hilum, borders (anterior, posterior, inferior), surfaces (costal, mediastinal, diaphragmatic), fissures (oblique, horizontal)
conducting zone: trachea, carina, bronchi, main bronchus (right, left), lobar/secondary bronchi (eparterial bronchus), segmental/tertiary bronchi (bronchopulmonary segment), bronchiole, terminal bronchiole
respiratory zone: respiratory bronchiole, alveolar duct, alveolus, alveolar-capillary barrier
pleurae: parietal pleura (cervical, costal, mediastinal, diaphragmatic), pulmonary pleura, pulmonary ligament, recesses (costomediastinal, costodiaphragmatic)
