Question

What does a CN IV palsy look like?

A) Inability to abduct the eye
B) Drooping eyelid
C) Double visionWhen looking to the right
D) Pupillary constriction on the affected side

Answer 1

A CN IV palsy, also known as a trochlear nerve palsy, refers to weakness or paralysis of the fourth cranial nerve. It is characterized by the inability to abduct the eye, drooping eyelid, and double vision when looking to the affected side. The correct answer to the question is A).

Step-by-step explanation:

A CN IV palsy, also known as a trochlear nerve palsy, refers to weakness or paralysis of the fourth cranial nerve. It can be identified by several signs and symptoms:

1. Inability to abduct the eye: The affected eye will have difficulty moving outwards, resulting in a crossed or inward direction of gaze.
2. Drooping eyelid: The affected eye may exhibit ptosis, which is the drooping of the upper eyelid.
3. Double vision when looking to the right: Diplopia or double vision may occur, particularly when the person tries to look to the side that is affected by the palsy.

Therefore, the correct answer to the question is A) Inability to abduct the eye.