Bronchus Segmentalis (histological specimen)

In some ways, the bronchi resemble the trachea - again in them we find hyaline cartilages (however of a rather irregular shape), smooth muscle cells, and seromucinous glands. On larger sections, lung tissue (or lung alveoli) may be located outside the bronchi.

• The epithelium is multi-row cylindrical with cilia (as in most places in the respiratory tract).
• Lamina propria (vessels, seromucinous glands and some smooth muscle).
• Smooth muscle causes postmortem contraction of the wall, so the mucosa is folded into small cilia (during life it adjusts the patency of the bronchi).
• Hyaline cartilage surrounded by perichondrium.

Multilayered columnar epithelium of airways

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Related Articles

• Asthma
• Bronchiolitis

References

• EIS, Wenceslas – JELINEK, Stephen – STARLING, Martin. Histopathological atlas [online]. ©2006. [cit. 2009-03-13]. <http://histologie.lf3.cuni.cz/histologie/atlas/index.htm>.

• JUNQUIERA, L. Carlos – CARNEIRO, Jose. Basics of histology. 1. edition. Jinocany : H&H, 1997. 502 pp. ISBN 80-85787-37-7.