File:Lung alveoli development cartoon.jpg

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Lung Alveoli Development

Cartoon showing the stages in development of human lung alveoli.

Human Lung Stages
Lung Stage Human Features Vascular
Embryonic week 4 to 5 lung buds originate as an outgrowth from the ventral wall of the foregut where lobar division occurs extra pulmonary artery then lobular artery
Pseudoglandular week 5 to 17 conducting epithelial tubes surrounded by thick mesenchyme are formed, extensive airway branching Pre-acinar arteries
Canalicular week 16 to 25 bronchioles are produced, increasing number of capillaries in close contact with cuboidal epithelium and the beginning of alveolar epithelium development Intra-acinar arteries
Saccular week 24 to 40 alveolar ducts and air sacs are developed alveolar duct arteries
Alveolar late fetal to 8 years secondary septation occurs, marked increase of the number and size of capillaries and alveoli alveolar capillaries
embryonic stage - pseudoglandular stage - canalicular stage - saccular stage - alveolar stage   Links: Species Stage Comparison | respiratory

Reference

Dilly SA. (1984). Scanning electron microscope study of the development of the human respiratory acinus. Thorax , 39, 733-42. PMID: 6495241

Image modified from: Scanning electron microscope study of the development of the human respiratory acinus.

Thorax 1984;39:733-742; doi:10.1136/thx.39.10.733 Copyright © 1984 BMJ Publishing Group Ltd & British Thoracic Society.


Cite this page: Hill, M.A. (2024, April 20) Embryology Lung alveoli development cartoon.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Lung_alveoli_development_cartoon.jpg

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© Dr Mark Hill 2024, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G

File history

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Date/TimeThumbnailDimensionsUserComment
current14:10, 24 August 2009Thumbnail for version as of 14:10, 24 August 2009500 × 652 (38 KB)MarkHill (talk | contribs)Lung alveoli development Image modified from: Scanning electron microscope study of the development of the human respiratory acinus. Dilly SA. Thorax. 1984 Oct;39(10):733-42. [http://www.ncbi.nlm.nih.gov/pubmed/6495241 PMID: 6495241] Thorax 1984;39:733