Fig. 6.

Histological images of the LV cross-sections of the native porcine hearts showed the microstructure of the epicardial layer (A–D). Epicardial elastin fibers covered a thickness range of 50 μm–200 μm and showed location-dependency and depth-dependency. The epicardial elastin fibers exhibited thick and distinguishable fibrous structure, with a wavy and meshed configuration. Movat's pentachrome staining: Collagen in yellow, elastin fibers in black, and cardiac muscles in red. Scale bar = 100 μm.