Fig. 6.

Structure of the anterior tibial (AT), posterior tibial (PT), and fibular (FA) arteries in longitudinal (left) and transverse (right) directions evaluated using Movat (elastin is black, glycosaminoglycans are greenish-gray) and Masson’s Trichrome (collagen is blue, smooth muscle is red) stains. Note directional differences in elastin (longitudinal fibers) and medial SMCs (mostly circumferential) demonstrated by the inserts. Compare the structure of these below-knee arteries to the arteries above the knee from the same subject (Fig. 5).