Cranial Nerves Review

Question 0

This continuation of CN IX catches a ride with the auriculotemporal n. (V2) to the parotid gland.

Answer 0

Lesser petrosal n.

Question 1

The chorda tympani catches a ride with this branch of V3 to the submandibular and parotid glands.

Answer 1

Lingual n.

Question 2

This continuation of CN VII catches a ride with these branches of V1 to the lacrimal gland.

Answer 2

Greater petrosal; zygomatic/lacrimal from V1

Question 3

This CN catches a ride with the ciliary nn. of CN V1 to the intrinsic mm. of the eye.

Answer 3

CN III

Question 4

Name the 3 divisions of V1 to the orbit.

Answer 4

Nasociliary
Lacrimal
Frontal (supratrochlear, supraorbital)

Question 5

Preganglionic parasympathetics of CN IX continue beyond the middle ear plexus as the __________ ___________ nerve to the otic ganglion.

Answer 5

Lesser petrosal nerve

Question 6

After exiting the skull initially with the rest of CN IX, the Tympanic N. ascends back into the tympanic cavity through a canal in the bone separating the Jugular foramen and Carotid canal called the ________ __________ .

Answer 6

Tympanic cannaliculus

Question 7

CN VII enters this canal after leaving the brainstem:

Answer 7

Internal acoustic meatus (becomes facial canal)

Question 8

The fibers of CN VII leave the facial canal as:

Answer 8

Greater petrosal n.

Question 9

Once leaving the facial canal, the greater petrosal n. is in this space:

Answer 9

Middle cranial fossa

Question 10

The greater petrosal n. Runs along the floor of the middle cranial cavity in this groove:

Answer 10

Groove of the greater petrosal n.

Question 11

The greater petrosal n. leaves the cranium for the last time via:

Answer 11

Drops into Foramen lacerum to reach pterygoid canal.

Question 12

Parasympathetic innervation to the ciliary and constrictor pupillae smooth muscles of the eye is via which CN?

Answer 12

CN III - Oculomotor nerve

Question 13

Name the two sympathetic nervous system smooth muscle targets in the eye.

Answer 13

Superior tarsal muscle and dilator pupillae muscle

Question 14

95% of sympathetic innervation to the head/neck travels on branches of ECA/ICA. The two that do not, travel on:

Answer 14

Nasociliary, short ciliary and long ciliary nn. to reach the dilator pupillae and superior tarsal m.

Question 15

CN XI exits the skull via this foramen:

Answer 15

Jugular foramen

Question 16

CN XII exits the skull via:

Answer 16

Hypoglossal canal

Question 17

CN XII passes medial or lateral to hyoglossus m.?

Answer 17

Lateral to hyoglossus m.

Question 18

A pt’s tongue deviates to the left when asked to protrude tongue. What nerve is affected and on what side of the body is the lesion?

Answer 18

Hypoglossal n. on the left side