Tech in Surgery Prep / Unit 3 TSC 064 short lesson, about 20 seconds
Why Vessel Walls Differ
Captions available
The idea
Arteries and veins share three wall layers: the tunica intima inside, the tunica media in the middle, and the tunica externa outside.
In practice
Arteries have thicker walls because they carry blood at higher pressure; veins have thinner walls, wider passages, and valves in large limb veins.
Where people slip
A thin-walled vein tears more easily under traction, which is why retraction near large veins is gentle.
Your place on the trail
Every lesson rests on earlier ones and opens later ones. Tap any to jump.
Something wrong in this lesson? Flag it · Sources for Tech in Surgery Prep