Topic Completed: 1 August 2011

Revised: 28 January 2019, last major update August 2011

Copyright: (c) 2003-2016,, Inc.

PubMed search: Embryology[title] lung

Elliot Weisenberg, M.D.
Page views in 2019: 779
Page views in 2020 to date: 299
Cite this page: Weisenberg E. Embryology. website. Accessed May 30th, 2020.
Definition / general
  • The lungs develop from the ventral wall of the foregut
  • The midline trachea develops two lateral outpouchings, the right and left lung buds
  • The lung buds extend into primitive thoracic mesenchyme that becomes bronchial cartilage and other connective tissue
  • The right lung bud develops three branches that become mainstem bronchi, the left lung bud develops two branches that become mainstem bronchi
  • The phases of lung development are embryonic (3 1/2 to 6 weeks), pseudoglandular (6 to 16 weeks), canalicular (16 to 28 weeks), saccular (28 to 36 weeks) and alveolar (36 weeks to term)
Diagrams / tables

Images hosted on other servers:

Various images

Microscopic (histologic) images

Images hosted on PathOut server:

Contributed by Dr. Grigory Demyashkin, I. M. Sechenov First Moscow State Medical University (Russia) - 6-8 week embryo:

Lung, glandular stage

Lung, glandular stage; top: spine

Top: spine; lower left: trachea & esophagus; center: lung, glandular stage

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