Alveolar duct
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| Alveolar duct | |
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| Detailed drawing of the alveoli from Gray's Anatomy, 1918 - Schematic longitudinal section of a primary lobule of the lung (anatomical unit); r. b respiratory bronchiole; al. d alveolar duct; at atria; a. s alveolar sac; 'a' alveolus or air cell; p. a.: pulmonary artery; p. v pulmonary vein; l lymphatic; l. n lymph node.] |
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| Part of a secondary lobule from the depth of a human lung, showing parts of several primary lobules. 1, bronchiole; 2, respiratory bronchiole; 3, alveolar duct; 4, atria; 5, alveolar sac; 6, alveolus or air cell: m, smooth muscle; a, branch pulmonary artery; v, branch pulmonary vein; s, septum between secondary lobules. |
Alveolar ducts are the tiny end tubules of the branching airways that fill the lungs. Each lung holds approximately 1.5 to 2 million of them. The tubules divide into alveolar sacs at the distal end.
In human anatomy, prior to the alveolar ducts exists the terminal bronchioles.
[edit] Additional images
 Bronchi, bronchial tree, and lungs |
[edit] External links
- Dictionary at eMedicine Alveolar+duct
- Anatomy Atlases - Microscopic Anatomy, plate 11.229 - "Alviolar Duct and Alveolar Sacs"
- Histology at BU 13607loa - "Respiratory System: lung (sheep), alveolar duct "
- Organology at UC Davis respiratory/lung/lung7/lung3 - "Mammal, lung (EM, Medium)"
- Histology at USC lng/c_29
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This respiratory system article is a stub. You can help Wikipedia by expanding it. |
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)
