The image shows blood vessels of a connective tissue, which is commonly a very vascularized, because the blood vessels that irrigate the tissues and organs lie inside it. Lymphatic vessels are also commonly found in the connective tissue.
The inner region of this blood vessel is filled with blood cells.
Connective tissue. Hematoxylin and eosin. Medium magnification.
Remember that blood vessels are small hollow tubes and after being sectioned they look like rings. You can see that the walls of these two blood vessels are very thin and are made up only of one layer of a simple squamous epithelium whose cells are thin. Their nuclei, which are also quite flat, can be clearly seen.
Like all epithelia, the endothelium is supported by a basement membrane, which is not visible in this image.
The epithelial cells that line the blood vessels – endothelial cells – are very thin and their nuclei, which are also quite flat, can be clearly seen. When you move the cursor over the image, the nuclei of the epithelial cells are highlighted in blue and the cytoplasm in red.