Question

IV, V and IX cranial nerves are

• A. Olfactory, spinal accessory and vagus
• B. Trigeminal, vagus and glossopharyngeal
• C. Occulomotor, trigeminal and hypoglossal
• D. Pathetic, trigeminal and glossopharyngeal

Answer 1

The correct option is D Pathetic, trigeminal and glossopharyngeal

The trochlear nerve (the fourth cranial nerve) is a motor nerve, that innervates a single muscle: the superior oblique muscle of the eye. Injury to the trochlear nerve cause weakness of downward eye movement with consequent vertical diplopia (double vision). To compensate for this, patients learn to tilt the head forward (tuck the chin in) in order to bring the fields back together to fuse the two images into a single visual field. This accounts for the dejected appearance of patients with pathetic nerve palsies.

The trigeminal nerve (the fifth cranial nerve) is a nerve responsible for sensation in the face and motor functions such as biting and chewing.

The glossopharyngeal nerve, known as the ninth cranial nerve, is a mixed nerve, that carries afferent sensory and efferent motor information.