WORKSHOP IN HISTOLOGY, CYTOLOGY AND EMBRYOLOGY - 2016

Chapter 5. SPECIAL HISTOLOGY

Cardiovascular System

Slide 78. Muscular-type vein.

Staining: hematoxylin and eosin.

Magnification: x400.

Compared to the previous slide ("Muscular-type artery"), the lumen of the vein is irregular in shape, the walls are thinner, and the internal and external elastic membranes are not well-defined. The tunics within the vein wall are difficult to distinguish, as the Connective Tissue forming the framework of the wall transitions continuously from one tunic to another, blending them into a single unit.

In the tunica intima (1), the endothelium (2) is clearly visible facing the lumen. A thin subendothelial layer can be observed in places. Without a sharp boundary, the intima transitions into the media (3). Within it, smooth myocytes (4) do not form a continuous layer, but instead lie in circular bundles interspersed with connective tissue layers. There is no clear demarcation between the media and the adventitia. The adventitial tunic (5) consists of loose connective tissue and contains vasa vasorum.

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Slide 78. Muscular-type vein.



Last update: 07/08/2026

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