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128 Veterinary Histology of Domestic Mammals and Birds
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6.16 Vein (pig). The single-celled endothelium lining the internal vessel wall is adjoined externally by a nar-
row subendothelial layer. There is no distinct internal elastic membrane in the low-pressure venous system. In
the tunica media, smooth muscle cells arranged in a predominantly circular orientation appear wavy due to
contraction of the vessel wall. The adventitia incorporates elastic fibres. Haematoxylin and eosin stain (x480).
6.17 Vein stained for elastic tissue (dog). Resorcin-fuchsin stain (x480).
6.18 Valves in the venous component of the pampiniform plexus (bull). Goldner’s Masson trichrome stain (x200).
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