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Flashcards in Cranial Nerves Deck (15)
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Cranial Nerve I

Olfactory: Sense of smell
Test: present with a non-irritating odor


Cranial Nerve II

Optic: vision
Test: Visual acuity, visual fields by confrontation, pupillary light reaction, near response


Cranial Nerve III

Oculomotor: Pupillary constriction, opening the eye (lid elevation), and most EOMs
Test: Pupillary light reaction, near response (constriction and accommodation), EOMs, convergence


Cranial Nerve IV

Trochlear nerve: Downward, internal rotation of the eye
Test: EOMs, convergence


Cranial Nerve V

Trigeminal nerve
1. ophthalmic: sensory information from the upper part of the face, including forehead, scalp and upper eyelids
2. maxillary: sensory information from the mid-face, including cheeks, upper lip and nasal cavity
3. mandibular: sensory information from ears, lower lip, chin; controls movement of muscles within jaw and ear

Test: Motor-clench teeth, open jaw, move side to side; Sensory-pain on forehead, cheeks, and chin; corneal reflex-touch cornea with cotton


Cranial Nerve VI

Abducens nerve: associated with lateral rectus muscle - outward eye movement
Test: Six cardinal fields of gaze, convergence


Cranial Nerve VII

Facial nerve: moving muscles used for facial expressions, provides taste for most of the tongue, salivary glands and tear-producing glands, outer ear sensation

Test: facial movements (expression, closing the eye, closing the mouth); taste for salty, sweet, sour and bitter; sensation from the ear


Cranial Nerve VIII

Vestibulocochlear nerve: balance & hearing

Test: Whispered voice test, Rinne and Weber


Cranial Nerve IX

Glossopharyngeal nerve: sensory info from sinuses, back of the throat, parts of inner ear, back part of the tongue; sense of taste to the back of the tongue; stimulates voluntary movement of a muscle in the back of the throat

Test: Difficulty swallowing, movement of soft palate and the pharynx (symmetric), uvula midline


Cranial Nerve X

Vagus nerve: communicates sensory info from ear canal and parts of throat, organs in chest and trunk; motor control of throat muscles; stimulates muscles of organs in chest/trunk; provides sense of taste near the root of the tongue

Test: Difficulty swallowing, movement of soft palate and the pharynx (symmetric), uvula midline


Cranial Nerve XI

Accessory nerve: motor nerve controls the muscles in the neck

Test: Look for atrophy or fasciculations, shrug against resistance, turn head to each side against hand, observe the contraction of the opposite SCM muscle and note the force of the movement against your hand


Cranial Nerve XII

Hypoglossal nerve: tongue motor movement

Test: Tongue protrude midline, move tongue side to side and note symmetry


Cranial nerve tests in infants:

II: visual acuity
II, III: response to light
III, IV, VI: extraocular movements


Cranial nerve tests in infants:

V: motor - rooting reflex, sucking reflex
VII: Facial - observe infant crying/smiling, note facial symmetry
□ Congenital facial nerve palsy can result from birth trauma or developmental defects
VIII: acoustic - acoustic blink reflex, tracking in response to sound


Cranial nerve tests in infants:
IX & X

IX, X: swallow & gag
□ Dysphagia: injury to IX, X, XII
XI: spinal accessory - symmetry of shoulders
XII: hypoglossal - coordination of sucking, swallowing, tongue thrusting; pinch nostrils - observe for reflex opening of the mouth