Secondary bronchus 2918104 178700758 2007-12-18T11:31:32Z ArielGold 395740 Reverted 2 edits by [[Special:Contributions/96.227.77.157|96.227.77.157]]; Rv test edits. [[WP:TWINKLE|TW]] {{Infobox Anatomy | Name = {{PAGENAME}} | Latin = bronchi lobares | GraySubject = | GrayPage = | Image = illu_quiz_lung05.jpg | Caption = 1. [[Vertebrate trachea|Trachea]]<BR>2. [[Mainstem bronchus]]<BR>3. Lobar bronchus<BR>4. [[Tertiary bronchus|Segmental bronchus]]<BR>5. [[Bronchiole]]<BR>6. [[Alveolar duct]]<BR>7. [[Pulmonary alveolus|Alveolus]] | Image2 = Gray961.png | Caption2 = Front view of cartilages of larynx, trachea, and bronchi. | System = | MeshName = | MeshNumber = | DorlandsPre = b_23 | DorlandsSuf = 12198332 | }} '''Secondary bronchi''' (also known as '''lobar bronchi''') arise from the [[primary bronchus|primary bronchi]], with each one serving as the airway to a specific lobe of the [[Human lung|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 gland]]s. 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== <gallery> Image:Illu bronchi lungs.jpg|Bronchi, bronchial tree, and lungs Image:Bronchi.JPG|Cross sectional cut of a human secondary bronchus </gallery> ==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 ==External links== * {{SUNYAnatomyFigs|19|08|03}} - "The divisions of the bronchus." * {{GPnotebook|825557051}} {{Lung}} [[Category:Respiratory system]] [[Category:Thorax]]