Question

Let's talk ptosis. Lesion the CN 3 nucleus- what kind of ptosis will you get? Lesion the CN3 at the nerve, what kind of ptosis will you get?

Answer 1

Lesion of the CN3 nucleus can cause internuclear ophthalmoplegia, while lesion of the CN3 at the nerve can cause ptosis.

Step-by-step explanation:

When the CN3 nucleus is lesioned, it can result in a condition called internuclear ophthalmoplegia, which is a deficit of conjugate lateral gaze. This means that the affected eye will not be able to move laterally. On the other hand, when the CN3 is lesioned at the nerve, it can lead to ptosis, which is drooping of the eyelid. This happens because the CN3 controls the levator palpebrae superioris muscle, which is responsible for lifting the eyelid.