Quiz #2 Cranial Nerves Flashcards
CN I
Olfactory
Not routinely tested unless reported loss of sense of smell, head trauma, abnormal mental status, or suspected intracranial lesion
CN II
Optic
Visual acuity
CN III
Oculomotor
Innervates EOMs. Moves eye up and out, up and in, inward, and down and out
CN IV
Trochlear
Innervates superior oblique muscle, moves eye down and in
CN V
Trigeminal
Responsible for biting and chewing, sensations of touch/pain for the face
Motor test: try to palpate the temporal and masseter muscles and try to separate the jaws with the hand
Sensory: test light touch sensation with a cotton wisp
CN VI
Abducens
Innervates lateral rectus muscle, abducts the eye (out)
CN VII
Facial Nerve
Somatosensory information from ear; controls muscles used in facial expression
Test: note mobility and facial symmetry. Have pt frown, close eyes, smile, lift eyebrows, and puff cheeks.
CN VIII
Acoustic (Vestibulocochlear)
Hearing and balance
Test hearing acuity, whispered voice test
CN IX
Glossopharyngeal
Taste from posterior 1/3 of the tongue, some swallowing muscles, sensory information from tongue
Test: depress tongue and note movement as person says ahh- uvula and soft paate should rise in the midline and tonsillar pillars should move medially
Touch posterior pharyngeal wall with tongue blade- elicits gag reflex
CN X
Vagus nerve
Sensory, motor and autonomic functions of viscera (glands, digestion, heart rate)
Touch posterior pharyngeal wall with tongue blade- elicits gag reflex
CN XI
Spinal Accessory nerve
Innervates sternomastoid and trapezius muscles
Test: ask pt to rotate head forcibly against resistance
Ask pt to shrug shoulders against resistance
CN XII
Hypoglossal
Tongue muscle control
Test tongue thrust- should be straight forward
Ask pt to say “light, tight, dynamite” to note clear, distinct lingual speech
Lesions on the nerve cause tongue to thrust towards the lesion.
