Tertiary bronchus
From Wikipedia, the free encyclopedia
| Tertiary bronchus | |
|---|---|
 |
|
| 1. Trachea 2. Mainstem bronchus 3. Lobar bronchus 4. Segmental bronchus 5. Bronchiole 6. Alveolar duct 7. Alveolus |
|
| Latin | bronchi segmentales |
| Dorlands/Elsevier | b_23/12198382 |
The tertiary bronchi (also known as the segmental bronchi) arise from the 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 bronchioles.
[edit] Additional images
 Bronchi, bronchial tree, and lungs |
 Cross sectional cut of tertiary bronchus |
 Human tertiary bronchus. |
[edit] References
Gartner, Leslie P. and James L. Hiatt. Color Textbook of Histology, 2nd ed. (2001). ISBN 0-7216-8806-3
[edit] External links
- GPnotebook 1147863100
- SUNY Labs 19:17-0100 - "Pleural Cavities and Lungs: The Bronchi and Their Divisions" (1/2)
- SUNY Labs 19:17-0200 - "Pleural Cavities and Lungs: The Bronchi and Their Divisions" (2/2)
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: trachea, carina, bronchi, main bronchus (right, left), lobar/secondary bronchi (eparterial bronchus), segmental/tertiary bronchi (bronchopulmonary segment), bronchiole, terminal bronchiole
respiratory zone: respiratory bronchiole, alveolar duct, alveolus, alveolar-capillary barrier
pleurae: parietal pleura (cervical, costal, mediastinal, diaphragmatic), pulmonary pleura, pulmonary ligament, recesses (costomediastinal, costodiaphragmatic)
