Which cranial nerves transmit nociceptive (pain) fibers from the head, EXCEPT which one?

The trochlear nerve (CN IV) is purely motor to the superior oblique muscle and does not carry pain (nociceptive) fibers. CN V, VII, IX, and X carry sensory/nociceptive input from head and neck structures.Other options: Trigeminal (V) is the major facial sensory nerve; facial (VII) and vagus (X) carry some sensory/nociceptive afferents.Key exam takeaway: CN IV (trochlear) is purely motor; the main pain nerve of the head is CN V (trigeminal).