Arteriole, SEM

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Arteriole, SEM

Arteriole. Coloured scanning electron micrograph (SEM) of a cross-section through a small human artery known as an arteriole. Red blood cells and some fibrin fibres are seen in the central lumen. The inner wall (tunica intima) of the lumen is thin and folded. It comprises an endothelial lining and a thin elastic layer that stretches. Around this is the thicker tunica media layer (pink), which is almost entirely formed of smooth muscle cells. The outer tunica adventitia layer merges with surrounding connective tissue. These layers enable the arteriole to expand and contract, regulating arterial blood pressure. Magnification: x1430 when printed 10cm wide

Science Photo Library features Science and Medical images including photos and illustrations

Media ID 6420613

© STEVE GSCHMEISSNER/SCIENCE PHOTO LIBRARY

Arteriole Circular Collagen Coloured Sem Endothelium Erythrocytes Fibrin Haematology Human Biology Lining Lumen Red Blood Cells Small Smooth Muscle Tunica Intima Tunica Media Vascular Artery Circulation Circulatory System

EDITORS COMMENTS
This print showcases the intricate details of an arteriole, a small human artery responsible for regulating arterial blood pressure. The image, captured using a coloured scanning electron microscope (SEM), reveals the complex layers and components that make up this vital part of our circulatory system. In the center lumen, we can observe red blood cells floating alongside fibrin fibers, creating a mesmerizing sight. The inner wall of the arteriole is thin and folded, known as the tunica intima. Composed of an endothelial lining and a stretchable elastic layer, it allows for expansion and contraction to maintain optimal blood flow. Surrounding the tunica intima is the thicker pink layer called tunica media. Almost entirely made up of smooth muscle cells, this layer plays a crucial role in controlling arterial pressure by contracting or relaxing accordingly. The outermost layer known as tunica adventitia merges seamlessly with surrounding connective tissue. Together with other layers, these structures ensure proper circulation within our bodies. With its circular shape and collagenous composition, this healthy arteriole represents normal functioning within our vascular system. This remarkable SEM image provides valuable insights into human biology while highlighting key elements such as erythrocytes (red blood cells) and elastic fibers. Displayed at x1430 magnification when printed 10cm wide, this print from Science Photo Library offers both scientific accuracy and aesthetic appeal—an ideal addition to any haematology or medical collection.

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