← Chapter 20
Anatomy & Physiology · Chapter 20
Blood Vessel Structure
The wall of an artery or vein is built in
three layers
— called
tunics
— wrapped around a hollow center. Tap each layer from the inside out.
Lumen
cross-section · inner → outer
Vessel structure
three tunics
The layers
📷 Reference image
A real labeled figure to compare with the interactive above.
Blood Vessel Structure — OpenStax, CC BY 3.0 (via Wikimedia Commons)
