Cranial Nerves — Overview

Which of the following cranial nerves is classified as purely motor?

A 68-year-old woman from Mumbai presents with acute-onset diplopia, ptosis of the right eyelid, and inability to adduct the right eye. On examination, the pupil on the right side is dilated and non-reactive to light. The left eye and all other cranial nerve functions are intact. Which cranial nerve is most likely affected?

All of the following cranial nerves have nuclei in the medulla EXCEPT:

Which cranial nerve carries preganglionic parasympathetic fibres to the ciliary ganglion for pupillary constriction?

A 52-year-old man presents with acute-onset diplopia, ptosis, and pupillary dilation on the left. Examination shows the left eye is 'down and out'. Which single finding best distinguishes this oculomotor nerve (CN III) lesion from an abducens nerve (CN VI) lesion?