Common cranial nerve lesions

Question 1

CN V motor lesions

Answer 1

Jaw will deviate toward the side of the lesion due to unopposed force on the opposite pterygoid muscle.

Question 2

CN X lesions

Answer 2

Uvula will deviate away from the side of the lesion

the weak side collapses and uvula points away

Question 3

CN XI lesions

Answer 3

Weakness during turning the head toward the contralateral side of the lesion (SCM)

Shoulder drop on the side of the lesion (trapezius)

**The left SCM contracts to turn the head to the right.

Question 4

wHICH NERVES PASS THROUGH THE CAVERNOUS SINUS?

Answer 4

CN III, IV, V1 and VI

AKA all the nerves that control the eye and V1

Pituitary tumors can effect this area.
CN 6 most commonly effected.

Question 5

Which portion of the ear can the ear bones be found?

Answer 5

Middle ear.

Amplifys sound from eardrum to inner ear.

Question 6

UMN lesion to facial nerve

Answer 6

Contralateral paralysis of the lower face, forehead spared because bilateral UMN innervation.

Question 7

LMN lesion to facial nerve

Answer 7

ipsilateral paralysis of upper and lower face.

Only the UMN supplies double innervation to forehead.

Question 8

What are the mastication muscles?

Which close and which open?

Answer 8

Masseter
Temporalis
Medial ptyrigoid all close

(only the lateral ptyrigoid opens)

Question 9

which area of the eye is the bind spot and which has a bunch of sensors?

Answer 9

The optic disc is blindspot

The fovea is the light sensitive area.