Question

Which blood vessel tunic is innervated by nerves from the sympathetic nervous system? tunica adventitia tunica externa

tunica media tunica intima

Answer 1

The tunica media of blood vessels is innervated by nerves from the sympathetic nervous system.

The four tunics of a blood vessel are:

• Tunica adventitia (the outermost layer)

• Tunica externa (the middle layer)

• Tunica media (the innermost layer)

• Tunica intima (the innermost layer)

Therefore, the tunica media is the middle layer of a blood vessel and is innervated by nerves from the sympathetic nervous system.