Multiple choice

The trochlear nerve is the only cranial nerve that exits from the dorsal side of the brainstem. Which of the following muscles would be affected if the nerve is inadvertently damaged?

  1. Superior oblique muscle

  2. The lateral rectus muscle

  3. Superior tarsal muscle

  4. Sphincter pupillae muscle

  5. Dilator pupillae muscle

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

Yes, it is correct. The trochlear nerve (IV) is the only cranial nerve to exit from the posterior surface of the brainstem. It innervates the superior oblique muscle.