left main bronchus

Arises at the bifurcation of the trachea, passes in front of the esophagus & enters the hilum of the left lung. -> gives off superior & inferior lobe bronchi The bronchus is longer, of narrow caliber & more nearly horizontal than the right main bronchus, thus aspirated objects enter it less frequently.

References

Stedman's Medical Dictionary 27th ed, Williams & Wilkins, Baltimore, 1999.