Question

SAH in a PCA. Cranial nerve involved?

Answer 1

The oculomotor nerve (CN III) is involved in a PCA stroke.

Step-by-step explanation:

The cranial nerve involved in a PCA (Posterior Communicating Artery) stroke is the oculomotor nerve (CN III).

The oculomotor nerve controls the movement of the eyes and certain muscles in the face. In a PCA stroke, when the blood flow to the posterior communicating artery is interrupted, it can lead to damage or dysfunction of the oculomotor nerve, resulting in symptoms such as ptosis (drooping of the eyelid), diplopia (double vision), and difficulty moving the eye outward or upward.