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two like structures that lead to the lungs and branch off into the broncoe. (trachea)

The two main bronchi are formed when the trachea (or windpipe) divides.

The right bronchus is more vertical than the left. It is also wider and shorter. It is approximately 2.5cm in length and after entering the right lung it divides into three branches (one going to each of the three lobes of the right lung). Each branch then divides into many smaller branches. As the bronchi get smaller, they are called bronchioles. Bronchioles become terminal bronchioles, then respiratory bronchioles, alveolar ducts.. and finally alveoli.

The left bronchus is about 5cm in length and is narrower than the right. After entering the left lung, it divides into two branches (one for each of the two lobes of the left lung). Each branch then divides into smaller bronchi in the same way as the bronchi in the right lung, ending in the alveoli.

The bronchi are lined with ciliated columnar epithelium. This contains cilia which are hair like extensions that propel materials along the airways. This helps to keep the airways clear.

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14y ago

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