Case

A 25 year old patient is admitted into your care complaining of headaches and are having trouble paying attention and feel disoriented. You notice the patient is experiencing difficulty with the left eye not able to look upwards.   

Question 2/2 - With an occulomotor palsy what other muscles will have limited/absent function?

Click on your selected option(s) below  (correct = 4 over-thinking = 5+)

Case Complete

Incorrect. Orbicularis oris are the muscle fibers around the mouth, controlled by the facial (VII) nerve

Correct! The oculomotor (III) nerve innervates the inferior rectus muscle which has a primary role in depressing the eyeball.

Correct! The oculomotor (III) nerve innervates the medial rectus muscle which has a primary role in adducting (looking to the midline) the eyeball.

Incorrect. The lateral rectus (abduction, lateral motion of the eyeball) is controlled by the abducens (IV) nerve.

Incorrect. The superior oblique muscle (intorsion, with secondary roles in depression/abduction) is controlled by the trochlear (IV) nerve.

Correct! The oculomotor nerve innervates the inferior oblique muscle which has a primary role in extorsion of the eyeball.

Incorrect. This is a muscle of facial expression controlled by the facial (VII) nerve, responsible for closing the eyelids.

Correct! The oculomotor nerve innervates the levator palpebrae superioris muscle which, as the name states, elevates the superior eyelid.