Tim Taylor is a senior writer at Innerbody Research focusing on human anatomy and physiology. Tim earned both his Bachelor of Science degree in Biology and his Master's degree in Teaching from the University of Pittsburgh.

Last updated: May 5th, 2025

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The tunica adventitia is the outer layer of the vein. It is also called the tunica externa, and is made up almost entirely of collagen; this anchors the vein to other bodily tissues and organs so it remains fixed in a stable position.

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