Left main bronchus

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Left main bronchus

Conducting passages.

Front view of cartilages of larynx, trachea, and bronchi.
Latin	Bronchus principalis sinister
Gray's	subject #237 1085

The left main bronchus (or left primary bronchus, or left principal bronchus) is smaller in caliber but longer than the right, being 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 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. it is red.

External links

left+main+bronchus at eMedicine Dictionary
SUNY Figs 19:08-02 - "The divisions of the bronchus."

This article incorporates text from a public domain edition of Gray's Anatomy.

Anatomy: Lower RT respiratory system (TA A06.3–5, TH H3.05.02, GA 11.1084)

TB tree

Trachea	Tracheal rings Annular ligaments of trachea Carina

Bronchus	main bronchus right left lobar/secondary bronchi eparterial bronchus segmental/tertiary bronchi

Lungs

General	Left lung/Right lung Base/Apex Root/Hilum Superior lobe Lingula of left lung/Middle lobe of right lung Inferior lobe borders: Anterior border Cardiac notch Posterior border Inferior border surfaces: Costal surface Mediastinal surface Cardiac impression Diaphragmatic surface fissures: Oblique fissure Horizontal fissure

BP segment	Bronchiole: Conducting zone (Terminal bronchiole) Respiratory zone (Respiratory bronchiole Alveolar duct Alveolus Blood-air barrier)

Cells	Pneumocyte (Type I pneumocyte Type II pneumocyte) Clara cell Goblet cell

M: RES

anat (n, x, l, c)/phys/devp

noco (c, p)/cong/tumr, sysi/epon, injr

proc, drug (R1/2/3/5/6/7)

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