Cranial Nerve 4

Question 1

What is the other name for C.N.4?

Answer 1

Trochlea nerve

Question 2

What type of information does C.N.4 have: sensory, motor, or mixed?

Answer 2

Motor

Question 3

What is the only muscle that C.N.4 supplies?

Answer 3

Superior Oblique

Question 4

Where is the trochlea nucleus located?

Answer 4

Periaqueductal gray, caudal to oculomotor nuclei

Question 5

What type of neurons does the trochlea nucleus give rise to?

Answer 5

LMN
(LOWER MOTOR NEURONS)
ALWAYS AND FOREVER AMEN

Question 6

What does the neurons from the trochlear nucleus do before exiting the midbrain?

Answer 6

Cross

Question 7

Where does the neurons from the trochlear nucleus exit?

Answer 7

Midbrain, inf to inf. colliculus

Question 8

What sends axons to the trochlear nucleus?

Answer 8

1. Cerebral Cortex (BRDMN area 8)
2. Sup. Colliculus
3. M.L.F (Medial longitudinal fasiculus)

Question 9

What is the pathway of the trochlear nerve after exiting the CNS?

Answer 9

Curves around brain stem and continues within lateral wall of cavernous sinus. Enters orbit thru sup. orbital fissure and supplies it’s muscle

Question 10

What does C.N.4 communicate with?

Answer 10

Cavernous Plexus

Question 11

What is the trochlear nerve named for?

Answer 11

Pulley-like mechanism on the medial aspect of orbit that the sup. Oblique muscle passes thru