FIGURE 10.19 ■ Structural comparison of layers in the walls of a vein and an
artery in the mesentery. Stain: Mallory-Azan. ×50.
FIGURE 10.20 ■ Comparison of a small artery and a vein with valves
surrounded by loose connective tissue with fibrocytes. Stain: hematoxylin and
eosin. ×50.
428