Brainstem II. Thalamus

Question 1

What does the tegmentum contain?

Answer 1

Ascending pathways

Descending pathways

Nuclei of cranial nerves

Question 2

CN exit the brain on

Answer 2

Ventral surface except Trochlear (IV CN)

Question 3

Trochlear (IV CN) exits the brain …

Answer 3

Dorsally

It gives collateral branches which exit below the inferior colliculi; however, they then turn ventral on both sides of the brainstem, going towards the cavernous sinus and then, the eyes.