Vein has endothelium and a thin subendothelial layer with smooth muscle cells among the connective tissue elements. Internal elastic membrane may or may not be present. The tunica media is much thinner. The tunica adventitia is usually thicker than the media and is mostly made of collagen fibres.
[smooth=id:57;]
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Vein Histology | howMed Images
Vein has endothelium and a thin subendothelial layer with smooth muscle cells among the connective tissue elements. Internal elastic membrane may or may not be present. The tunica media is much thinner. The tunica adventitia is usually thicker than the media and is mostly made of collagen fibres.
[smooth=id:57;]
Want a clearer concept, also see
Aorta
Artery
Artery, Vein and Nerve