Multiple choice

The outermost layer of a blood vessel is known as

  1. The tunica intima

  2. The tunica media

  3. The tunica externa

  4. The pericardium

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The tunica externa, also known as the tunica adventitia (or adventitia), is the outermost layer of a blood vessel, surrounding the tunica media. It is mainly composed of collagen and is supported by external elastic lamina.