Secondary bronchus
Secondary bronchus
1. Trachea Segmental bronchus Bronchiole Alveolus
Front view of cartilages of larynx, trachea, and bronchi.
Latin
bronchi lobares
Dorlands/Elsevier
b_23/12198332
Secondary bronchi (also known as lobar bronchi ) arise from the primary bronchi, with each one serving as the airway to a specific lobe of the lung .
Structure
They have relatively large lumens that are lined by respiratory epithelium . There is a smooth muscle layer below the epithelium arranged as two ribbons of muscle that spiral in opposite directions. This smooth muscle layer contains seromucous glands. Irregularly arranged plates of hyaline cartilage surround the smooth muscle. These plates give structural support to the bronchus and maintain the patency of the lumen.
Secondary bronchi of left lung
superior lobe bronchus
inferior lobe bronchus
Secondary bronchi of right lung
superior lobe bronchus (or eparterial bronchus)
middle lobe bronchus
inferior lobe bronchus
Additional images
References
Gartner, Leslie P. and James L. Hiatt. Color Atlas of Histology, 3rd ed. (2000). ISBN 0-7817-3509-2
Gartner, Leslie P. and James L. Hiatt. Color Textbook of Histology, 2nd ed. (2001). ISBN 0-7216-8806-3
Anatomy of torso, respiratory system : Lungs and related structures
lungs
right • left • lingula • apex • base • root • cardiac notch • cardiac impression • hilum • borders (anterior, posterior, inferior) • surfaces (costal, mediastinal, diaphragmatic) • fissures (oblique, horizontal)
conducting zone
respiratory zone
respiratory bronchiole • alveolar duct • alveolus • alveolar-capillary barrier
pleurae
parietal pleura (cervical, costal, mediastinal, diaphragmatic) • visceral pleura • pulmonary ligament • recesses (costomediastinal, costodiaphragmatic) • pleural cavity
This article is licensed under the GNU Free Documentation License . It uses material from the Wikipedia article "Secondary_bronchus" . A list of authors is available in Wikipedia.
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