Cranial Nerves
0Loading crowd target
0Loading crowd target
7correct to beat the crowd
40 free Cranial Nerves trivia questions with answers — science & nature quiz, new questions added Oct 2026.
The cranial nerves are the twelve pairs of nerves that leave the brain directly instead of travelling through the spinal cord. Between them they handle smell, sight, taste, eye movement, facial expression, swallowing, speech and the unconscious control of the heart and gut, which is why they sit at the centre of every anatomy course and every neurological examination. This quiz covers the ground a student is expected to know: the names and their numbered sequence, which nerve does which job, the openings each one uses to leave the skull, and the tell-tale deficits that appear when a single nerve is damaged. There is some history as well, from the ancient physicians who first counted the nerves to the anatomists who settled the modern list. It is written for nursing, medical and anatomy students revising for an exam, and for anyone curious about how the head is wired. Every answer comes with a short explanation, so a wrong guess still teaches something.
30 of 40 questions with answers and explanations. Play the quiz
Q 01Brain freeze, the ice-cream headache felt in the forehead, is pain carried by which cranial nerve?
Trigeminal
The trigeminal nerve is thought to sense blood vessels in the palate tightening and then swelling after sudden cold, and the brain misreads the pain as coming from the forehead.
Q 02The vagus nerve, which reaches from the skull to the colon, is named from a Latin word meaning what?
Wandering
Wandering is the literal meaning of the Latin vagus, and the same root gives English the words vagrant, vagabond and vague.
Q 03Which condition, named for a Scottish surgeon, is a sudden one-sided paralysis of the facial nerve?
Bell's palsy
Bell's palsy usually shows as a facial droop that comes on within 72 hours, and most people start to improve within about two weeks.
Q 04The facial nerve controls the stapedius, the smallest skeletal muscle in the body, found where?
Middle ear
The middle ear holds the stapedius, which steadies the tiny stapes bone; when it is paralysed, normal sounds seem very loud.
Q 05Excessive vagus nerve activity during emotional stress can cut the heart's output and cause what?
Fainting
Fainting of this vasovagal kind is typically set off by the sight of blood, pain or long standing, and people come round without any treatment.
Q 06The point where the optic nerve leaves the retina creates which feature of every healthy eye's vision?
A blind spot
A blind spot forms because the disc where the nerve exits has no light-detecting cells, but the brain fills the gap from surrounding detail and the other eye.
Q 07A pacemaker-like implant under the collarbone pulses the vagus nerve to treat which condition?
Epilepsy
Epilepsy that drugs cannot control is the main use: the generator sends regular electrical pulses to the nerve in the neck, and it is also approved for stubborn depression.
Q 08The eighth cranial nerve, which shares a bony canal with the facial nerve, carries which two senses?
Hearing and balance
Hearing and balance travel together because the eighth nerve is two bundles in one: a cochlear nerve for sound and a vestibular nerve for equilibrium.
Q 09A shoulder shrug tests the eleventh cranial nerve because that nerve powers which large muscle?
Trapezius
Trapezius is the shrugging muscle, so when its nerve is injured the shoulder droops and lifting the arm out to the side becomes difficult.
Q 10The Rinne and Weber tests, two screening checks for deafness, both rely on which simple instrument?
Tuning fork
A tuning fork, usually vibrating at 512 Hz, lets the examiner compare sound carried through air with sound carried through bone to tell two kinds of deafness apart.
Q 11Which cranial nerve raises the upper eyelid and controls most of the muscles that move the eyeball?
Oculomotor
The oculomotor nerve also carries the fibres that narrow the pupil, so complete damage leaves the eye turned down and out with a wide pupil.
Q 12Which cranial nerve, the smallest by number of nerve fibres, controls just one muscle of the eye?
Trochlear
The trochlear nerve is also the only cranial nerve to emerge from the back of the midbrain, and it runs the longest course inside the skull.
Q 13Which cranial nerve controls only the muscle that swings the eye outward, away from the nose?
Abducens
The abducens nerve works the lateral rectus alone, so when it fails the unopposed medial rectus pulls the eye in toward the nose.
Q 21Besides ophthalmic and maxillary, which division of the fifth cranial nerve alone has motor fibres?
Mandibular
Mandibular is the only division that moves muscles as well as feeling touch, and it leaves the skull through its own opening, the foramen ovale.
Q 22The fifth cranial nerve powers the masseter and temporalis, the main muscles used for which action?
Chewing
Chewing relies on four muscles on each side, the masseter, the temporal muscle and two pterygoids, and the same nerve also tenses the eardrum.
Q 23The facial nerve's chorda tympani branch carries taste from which part of the tongue?
Front two-thirds
Front two-thirds is this nerve's territory for taste, yet ordinary touch from the very same area travels in a different nerve altogether.
Q 14Which cranial nerve senses blood pressure at the carotid sinus and the touch that sets off gagging?
Glossopharyngeal
The glossopharyngeal nerve has just one muscle to command, the stylopharyngeus, which lifts the throat during swallowing and speech.
Q 15Which cranial nerve arises from nerve cells in the upper spinal cord rather than in the brain?
Accessory
The accessory nerve climbs through the foramen magnum and then leaves again, making it the only cranial nerve to both enter and exit the skull.
Q 16Damage to which cranial nerve makes the tongue curve toward the injured side when it is stuck out?
Hypoglossal
The hypoglossal nerve moves nearly every tongue muscle, so losing one side leaves the healthy side pushing the tip across unopposed.
Q 17Damage to the third cranial nerve can leave the upper eyelid drooping, a sign known by what name?
Ptosis
Ptosis appears because the third nerve powers the muscle that lifts the lid, and the pupil on that side is often widened as well.
Q 18Which eye muscle, its tendon looped through a pulley, is the fourth cranial nerve's only target?
Superior oblique
The superior oblique pulls the eye downward best when it is turned in, so examiners test it by asking the patient to look toward the nose and then down.
Q 19Which gland is threaded by the facial nerve but takes its orders from the ninth cranial nerve?
Parotid
The parotid gland, the largest of the salivary glands, sits in front of each ear; the facial nerve splits into its branches inside it without supplying it.
Q 20The twelfth cranial nerve exits through a canal just above the condyles of which skull bone?
Occipital
The occipital bone hides this canal on each side, and quirks of development sometimes leave a person with more than two of them.
Q 24Which skull-base opening lets the ninth, tenth and eleventh cranial nerves all leave together?
Jugular foramen
The jugular foramen also passes the large vein that drains blood from the brain, and it is usually slightly larger on the right side than on the left.
Q 25Olfactory nerve fibres pass to the roof of the nose through tiny holes in which part of the ethmoid?
Cribriform plate
The cribriform plate also supports the olfactory bulbs, and with age its openings can close up and pinch the fibres passing through.
Q 26Fibres from the inner half of each retina cross sides at which X-shaped structure beneath the brain?
Optic chiasm
The optic chiasm lets each half of the brain's visual cortex receive the same half of the visual field from both eyes.
Q 27Optic neuritis, a painful inflammation of the optic nerve, is often an early sign of which disease?
Multiple sclerosis
Multiple sclerosis first shows itself as this eye inflammation in roughly one in five patients, and up to half develop it at some point.
Q 28Which term means loss of smell, a common result of head injuries that damage the olfactory nerve?
Anosmia
Anosmia after a head injury can be permanent, and because smell feeds flavour, people who have it often find their sense of taste dulled as well.
Q 29The first two pairs of cranial nerves, for smell and sight, emerge from which part of the brain?
Cerebrum
The cerebrum gives rise to only those two pairs; the rest emerge lower down, mostly from the brainstem.
Q 30The Roman numerals given to the twelve pairs of cranial nerves follow which ordering principle?
Front-to-back position
Front-to-back position on the brain decides the number, so the nerve of smell, emerging furthest forward, is first and the tongue's motor nerve is last.