Exam 1: Abducens Nerve

Question 1

CN 6 supplies

Answer 1

Lateral rectus

Question 2

Apparent origin of CN6

Answer 2

Medullopontine sulcus

Question 3

Abducens nuclei location

Answer 3

Caudal part of pons (Tegmentum) , floor of rhomboid fossa

Question 4

Axons from abducens nuclei travel

Answer 4

Anterior

Question 5

Abducens receives input from

Answer 5

MLF
BM8
Superior colliculus

Question 6

Abducens nerve penetrates dura and travels along

Answer 6

Cavernous sinus

Question 7

Internal strabismus

Answer 7

Eyes converge

Question 8

External strabismus

Answer 8

Eyes diverge

Question 9

Diplopia

Answer 9

Double vision

Question 10

Strabismus

Answer 10

Eyes not aligned

Question 11

Diplopia is

Answer 11

Subjective

Question 12

Ptosis

Answer 12

Drooping eyelid due to weakness of levator palpebra superioris

Question 13

____ lesions may be cause of ptosis

Answer 13

Oculomotor Nerve (superior ramus)

Question 14

Ptosis presents

Answer 14

Unilaterally

Question 15

Internal ophthalmoplegia

Answer 15

Inability to constrict pupil
Loss of light reflex
Loss of accommodation reflex

Question 16

Trochlear paralysis is

Answer 16

Rare

Question 17

Abducens paralysis is

Answer 17

Most common

Question 18

Internuclear opthalmoplegia involves damage to

Answer 18

MLF

Question 19

Signs of external ophthalmoplegia

Answer 19

External strabismus
Diplopia
Ptosis

Question 20

Signs of trochlear paralysis

Answer 20

Internal strabismus

Question 21

Signs of abducens paralysis

Answer 21

Internal strabismus