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of or relating to the bronchus: Latin bronchus; Greek βρόγχος (brónkhos), windpipe bronchitis, bronchiolitis obliterans: bucc(o)-of or pertaining to the cheek: Latin bucca, cheek buccolabial burs(o)-bursa (fluid sac between the bones) Latin bursa, purse; Greek βύρσα (búrsa), hide, wine-skin bursa, bursitis
A bronchus (/ ˈ b r ɒ ŋ k ə s / BRONG-kəs; pl.: bronchi, / ˈ b r ɒ ŋ k aɪ / BRONG-ky) is a passage or airway in the lower respiratory tract that conducts air into the lungs.The first or primary bronchi to branch from the trachea at the carina are the right main bronchus and the left main bronchus.
The lung has a left-right symmetry and each bud known as a bronchial bud grows out as a tubular epithelium that becomes a bronchus. Each bronchus branches into bronchioles. [55] The branching is a result of the tip of each tube bifurcating. [53] The branching process forms the bronchi, bronchioles, and ultimately the alveoli. [53]
Lungs showing bronchi and bronchioles. The trachea divides into the left main bronchus which supplies the left lung, and the right main bronchus which supplies the right lung. As they enter the lungs these primary bronchi branch into secondary bronchi known as lobar bronchi which supply each lobe of the lung.
Asthma is the result of chronic inflammation of the conducting zone of the airways (most especially the bronchi and bronchioles), which subsequently results in increased contractability of the surrounding smooth muscles. [21] This among other factors leads to bouts of narrowing of the airway and the classic symptoms of wheezing.
[2] 20% of foreign bodies become lodged in the upper airway, while 80% become lodged in a bronchus. [6] Signs of foreign body aspiration are usually abrupt in onset and can involve coughing, choking, and/or wheezing ; however, symptoms can be slower in onset if the foreign body does not cause a large degree of obstruction of the airway. [ 2 ]
The first bronchi to branch from the trachea are the right and left main bronchi. Second, only in diameter to the trachea (1.8 cm), these bronchi (1–1.4 cm in diameter) [ 5 ] enter the lungs at each hilum , where they branch into narrower secondary bronchi known as lobar bronchi, and these branch into narrower tertiary bronchi known as ...
The lower respiratory tract is also called the respiratory tree or tracheobronchial tree, to describe the branching structure of airways supplying air to the lungs, and includes the trachea, bronchi and bronchioles. [8] trachea. main bronchus (diameter approximately 1 – 1.4 cm in adults) [9] lobar bronchus (diameter approximately 1 cm)