Mainstem bronchus

Mainstem Bronchus

The Mainstem Bronchus is a significant part of the human respiratory system. It is the airway in the respiratory tract that conducts air into the lungs. The mainstem bronchus branches from the bottom of the trachea into two bronchi that lead to the right and left lungs.

Anatomy

The mainstem bronchus divides into the right and left main bronchi. The right main bronchus is wider, shorter, and more vertical than the left main bronchus. It is approximately 2.5 cm long and angles at about 25 degrees. The left main bronchus is narrower, longer, and more horizontal than the right. It is approximately 5 cm long and angles at about 45 degrees.

Function

The main function of the mainstem bronchus is to carry air from the trachea into the lungs. It does this by branching into smaller and smaller tubes, which eventually lead to the alveoli, where gas exchange occurs.

Clinical Significance

The mainstem bronchus is a critical structure in the respiratory system, and its dysfunction can lead to serious health problems. Conditions such as bronchitis, asthma, and lung cancer can affect the mainstem bronchus. In particular, foreign bodies are more likely to lodge in the right mainstem bronchus due to its more vertical orientation.

See Also

• Bronchus
• Respiratory System
• Trachea
• Lung

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