Evidence for the Primo Vascular System above the Epicardia of Rat Hearts
Figure 7
Light and transmission electron microscopy (TEM) images of a longitudinal sectioned PV just above the epicardium. Image (a) shows a toluidine blue-stained PV (dotted lined) above the epicardium (red-colored line). (b) TEM low-magnification view of longitudinal sectioned PV corresponding to the rectangle of image (a). Red-colored line also indicates the epicardium. Image (c) is magnified from the rectangle of (b). Image (d) shows high magnification of the rectangle of (c) in which there are high-electron-density microgranules (arrows) in the lumen of the PV. Asterisks indicate the presence of fine fibers. PC means putative endothelial cells.
