Details of the three layers of the vein wall can be observed with the objective of 100x: intima (showing the nuclei of the endothelial cells), media (showing the  nuclei (yellow) of the smooth muscle fibers), and adventitia (showing the nuclei of the fibrocytes and the collagen fibers)

Details of the three layers of the vein wall can be observed with the objective of 100x: intima (showing the nuclei of the endothelial cells), media, showing the  of the smooth muscle fibers, and adventitia (showing the nuclei of the fibrocytes and the collagen fibers)