Secondary bronchus
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178700758
2007-12-18T11:31:32Z
ArielGold
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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]]