left main bronchus

(redirected from Left bronchus)

left main bron·chus

[TA] Avoid the incorrect term left main stem (or mainstem) bronchus.
primary division of the tracheobronchial tree arising as the left branch of the bifurcation of the trachea, then passing in front of the esophagus and enters the hilum of the left lung where it divides into a superior lobe bronchus and an inferior lobe bronchus. It is longer, of narrower caliber, and more nearly horizontal than the right main bronchus, hence, aspirated objects enter it less frequently.
References in periodicals archive ?
Another possible cause of desaturation during bronchoscopy may be a combination of an occluded right main bronchus due to a foreign body, with a non-ventilated left bronchus due to the ventilating tip of the bronchoscope being in the right bronchus.
An incision was made in the trachea 1 cm above the carina to gain access to the left bronchus.
Daniilidis et at found that foreign bodies were more common in the left bronchus than in the right, and they speculated that the difference might be attributable to the right-handedness of most patients and to their posture.