Tertiary bronchus
2918174
141581065
2007-06-30T11:23:07Z
87.242.142.6
{{Infobox Anatomy |
Name = {{PAGENAME}} |
Latin = bronchi segmentales |
GraySubject = |
GrayPage = |
Image = illu_quiz_lung05.jpg |
Caption = 1. [[Vertebrate trachea|Trachea]]<BR>2. [[Mainstem bronchus]]<BR>3. [[Secondary bronchus|Lobar bronchus]]<BR>4. [[Tertiary bronchus|Segmental bronchus]]<BR>5. [[Bronchiole]]<BR>6. [[Alveolar duct]]<BR>7. [[Pulmonary alveolus|Alveolus]] |
Image2 = |
Caption2 = |
System = |
MeshName = |
MeshNumber = |
DorlandsPre = b_23 |
DorlandsSuf = 12198382 |
}}
The '''tertiary bronchi''' (also known as the '''segmental bronchi''') arise from the [[secondary bronchus|secondary bronchi]]. The [[respiratory epithelium]] lining their lumen is surrounded by a layer of [[smooth muscle]]. This layer is composed of two ribbons of smooth muscle that spiral in opposite directions. The smooth muscle layer is surrounded by irregular plates of [[hyaline cartilage]] which help maintain the patency of the airway.
Each of the tertiary bronchi serves a specific [[bronchopulmonary segment]]. There are 10 tertiary bronchi in the right lung, and eight in the left.
The tertiary bronchi get smaller and divide into [[primary bronchiole]]s.
==Additional images==
<gallery>
Image:Illu bronchi lungs.jpg|Bronchi, bronchial tree, and lungs
Image:Terminal bronchiole.JPG|Cross sectional cut of terminal bronchiole
Image:Respiratory_bronchus2.JPG|Human respiratory bronchiole.
</gallery>
==References==
Gartner, Leslie P. and James L. Hiatt. <u>Color Textbook of Histology, 2nd ed.</u> (2001). ISBN 0-7216-8806-3
==External links==
* {{GPnotebook|1147863100}}
* {{SUNYAnatomyLabs|19|17|01|00}} - "Pleural Cavities and Lungs: The Bronchi and Their Divisions" (1/2)
* {{SUNYAnatomyLabs|19|17|02|00}} - "Pleural Cavities and Lungs: The Bronchi and Their Divisions" (2/2)
{{Lung}}
[[Category:Respiratory system]] [[Category:Human anatomy]] [[Category:Thorax]]