TBI: CN Damage

Question 1

CN I is only involved in about 7% of all TBIs, and is most commonly damaged with what type of injury?

Answer 1

concussions

Question 2

Examination of the eyes is crucial for what CNs?

Answer 2

II, III, IV, VI

Question 3

Which CNs are typically only damaged in very superficial injuries?

Answer 3

III, IV, VI

Question 4

Intact pupillary function indicates that the injury is above the level of the ____

Answer 4

brainstem

Question 5

Conjugate gaze palsy is seen with ___ injuries

Answer 5

CNS

Question 6

Unilateral gaze palsy is seen with ___ injuries

Answer 6

PNS

Question 7

Tonic downward gaze is seen with severe injury to what 3 areas?

Answer 7

thalamus, midbrain, or pons

Question 8

Rapid horizontal eye movement is associated with ____

Answer 8

seizures

Question 9

Monocular blindness and absent pupillary response are symptoms of damage to which CN?

Answer 9

II (optic)

Question 10

PNS gaze abnormalities are commonly seen with damage to which CN?

Answer 10

VI (abducens)

Question 11

T/F: oculomotor and trochlear nerve damage is common in TBIs

Answer 11

False! Damage to these nerves is less common. We typically see direct damage of the actual muscle bellies and tendons instead.

Question 12

When is the trigeminal nerve typically damaged?

Answer 12

peripheral injuries to the area where the divisions leave the orbit

Question 13

What are some symptoms of trigeminal nerve damage?

Answer 13

loss of sensation to nose, eyebrow, and forehead

Question 14

When is the facial nerve typically damaged?

Answer 14

peripheral injuries that damage the temporal bone

Question 15

What are some symptoms of facial nerve damage?

Answer 15

• muscle weakness
• loss of tear production
• dec saliva secretion
• taste