(Description) Figure 8 A section of the adrenal gland (cortex), stained with haematoxylin and eosin. Cell nuclei are stained deep blue and the cytoplasm is pink. The capsule, the outer envelope, of the organ (large arrow) is also pink. The erythrocytes (red blood cells) seen within small blood vessels (small arrow) are red. Scale bar = 50 µm. Skip to main content This is an image of a section of the adrenal gland.