8.6 POJA-L415. Terminal sac period of developing lung (1)

​8.6  POJA-L415

Title:  Terminal sac period of developing lung (1) 

Description:
Stain hematoxylin-eosin, human fetus. At the right cross-sections of a large bronchus (1) with cartilage rings (2). Close to them a pulmonary artery (3), and a bronchiole (4) without cartilage. (5) indicates a respiratory bronchiolus. Most alveoli are not inflated, the numerous dilated spaces (6) are saccules derived from the primitive respiratory channels, hence the name terminal sac period.

8.6 POJA-L416. Terminal sac period of developing lung (2)

​8.6  POJA-L416

Title:  Terminal sac period of developing lung (2) 

Description:
Stain hematoxylin-eosin, human fetus. The transition of a terminal bronchiolus (1) into two future respiratory bronchioli (2), present as dilated spaces (saccules derived from the primitive respiratory channels, hence the name terminal sac period). The surrounding cellular tissue is composed of developing primitive channels and non-inflated alveoli within the mesenchyme.

Keywords/Mesh: respiratory tract, lung development, fetus,
terminal sac period, pulmonary artery, bronchus, bronchiole, 
respiratory bronchiole, alveolus, mesenchyme, histology, embryology, POJA collection

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