The lumen of the vessel contains red blood cells and several basophilic leukocytes.

Inside the unstained wavy internal elastic lamella (blue arrows), the nuclei of endothelial cells (N) are seen in depressions of the intima. These folds are artefacts due to the contraction of the tissues during fixation.

The media (M) shows three to five concentric layers of smooth muscle cells.

The adventitia (A), composed of dense connective tissue, is bright blue-green in this preparation.

Stain: Masson’s Trichrome
Magnification: ×650