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

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

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	Date/Time	Thumbnail	Dimensions	User	Comment
current	14:10, 24 August 2009		500 × 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

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