File:Pulmonary Pleura - pseudoglandular and canalicular stages 01.jpg

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Pulmonary Pleura at the Pseudoglandular and Canalicular Stages

Rough lung surface and pulmonary pleura at the pseudoglandular and canalicular phases. (Stain - Haematoxylin Eosin) Sagittal sections.

Panel A - left lung from a specimen at 9 weeks (39 mm crown-rump length CRL)

Panels B–D - right lung from a specimen at 10 weeks (56 mm CRL).

Panels C–E - higher magnification view of squares in panel B, respectively.

In panel A, outward growing bronchi provide small protrusions of the lateral or costal surface (arrows). A rough surface is also evident in the costal aspect in panel B, but a mesenchymal tissue (stars) is present beneath the thin pleura (E). Deep intersegmental veins do not reach the lung surface (arrowheads in B).

The canalicular phase of the bronchus was mixed with the pseudoglandular phase. upper, upper lobe; middle, middle lobe; lower, lower lobe; B6 and B8, sixth and eighth segmental bronchi; LLB, lower lobar bronchus; MLB, middle lobar bronchus; ULB, upper lobar bronchus.

Scale bars = 1 mm (A, B), 0.1 mm (C–E).

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Yamamoto M, Wilting J, Abe H, Murakami G, Rodríguez-Vázquez JF & Abe SI. (2018). Development of the pulmonary pleura with special reference to the lung surface morphology: a study using human fetuses. Anat Cell Biol , 51, 150-157. PMID: 30310706 DOI.


Copyright © 2018. Anatomy & Cell Biology

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License ( which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Original file name - Fig. 1. Acb-51-150-g001-l.jpg Image adjusted in size and PMID added.

Cite this page: Hill, M.A. (2024, June 21) Embryology Pulmonary Pleura - pseudoglandular and canalicular stages 01.jpg. Retrieved from

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

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current09:43, 20 November 2018Thumbnail for version as of 09:43, 20 November 20181,280 × 1,863 (707 KB)Z8600021 (talk | contribs)==Pulmonary Pleura at the Pseudoglandular and Canalicular Stages== Rough lung surface and pulmonary pleura at the pseudoglandular and canalicular phases. H&E staining. Sagittal sections. Panel A displays the left lung from a specimen at 9 weeks (39 mm...

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