Neuro Exam 2: Cranial Nerve Examination

loss of function

when testing cranial nerves, a positive test means:

CN I

Ask patient to close his/her eyes and pinch one nostril shut. Put a familiar scent, such as coffee or cinnamon underneath their nose and ask them to identify the scent. This test assesses what cranial nerve?

CN I

inability to identify a scent indicated loss of function of what CN?

inability to identify scent

what defines a positive test for CN I loss of function?

CN II

Shine a light in the patient's eye (while blocking the other eye) and observe for pupil constriction on same side. This test assesses what cranial nerve?

loss of pupil constriction bilaterally

what defines a positive test for CN II lesion?

CN II

loss of pupil constriction bilaterally indicates loss of function of what CN?

CN II

the Snellen Eye Chart assesses what CN?

CN II

Visual field: use your hand to see where the patient can begin to see in all fields (peripheral vision). This test assesses what CN?

CN III, CN IV, CN VI

Asking a patient to follow your finger while you trace the letter H assesses what CN?

superior oblique of eye

CN IV innervates what muscle?

CN IV

a patient who is unable to move their eye infero-medially may have a lesion at what CN?

CN IV

a patients whose eye deviates up and medially may have a lesion at what CN?

lateral rectus of eye

CN VI innervates what muscle?

CN VI

a patient who is unable to move their eye laterally may have a lesion at what CN?

CN III

a patient who is unable to move their eye in any movements except laterally and infero-medially may have a lesion at what CN (can only look down and lateral)?

CN III

a patient with a fixed dilated pupil may have a lesion at what CN?

ipsilateral

inability to move the eyes in any 1 direction could indicate a lesion on the _______ side

CN V ( sensory division)

asking a patient to close their eyes and distinguish sharp and soft touch on the forehead, maxilla and mandible will test what CN?

opthalmic division of trigeminal nerve

placing a sharp object on the patients forehead with specifically test what division of the trigeminal nerve?

opthalmic division of trigeminal nerve

receives sensory input from the surface of the eye, afferents for blink reflex:

CN VII

effent for blink reflex:

maxillary division of trigeminal nerve

placing a sharp object on the patients cheek with specifically test what division of the trigeminal nerve?

mandibular division of trigeminal nerve

placing a sharp object on the patients chin with specifically test what division of the trigeminal nerve?

CN V (motor division)

asking a patient to clench their teeth and open their mouth against pressure asesses what CN?

CN V ( sensory division)

inability to feel or distinguish touch on the face indicates a positive test for a lesion at what CN?

CN V (motor division)

unequal muscle tension when clenching teeth indicates a positive test for a lesion at what CN?

CN V and CN VII

While the patient is looking straight ahead, gently brush the wisp against the lateral aspect of the sclera (outer white area of the eye ball). This test assesses the function of what CN?

CN VII

a patient is asked to smile, squint, and raise eyebrows, and they do so asymmetrically. This indicates a positive test for a lesion at what CN?

CN VIII

The Webber and Rinne tests are used to asses what CN?

Webber test

this test is used for hearing lateralization:

Rinne test

this test compares air conduction to bone conduction:

CN VIII

whispering or rubbing a glove together and asking a patient if they can hear it assesses what CN?

CN VIII

if a patient has the inability to balance, there may be a lesion at what CN?

CN VIII

a patients that presents with nystagmus of the eyes may have a lesion at what CN?

CN IX and CN X

testing the gag reflex will asses what CN?

CN IX and CN X

this CN controls motor to the larynx and pharynx:

CN X

if a patient is hoarse, what CN may have a lesion?

CN X, right

if a patient opens their mouth and says "aaahhh" and the uvula deviates to the left, what CN and what side is the lesion?

CN X, left

if a patient opens their mouth and says "aaahhh" and the uvula deviates to the right, what CN and what side is the lesion?

trapezius and sternocleidomastoid muscles

CN XI innervated what muscles?

CN XI

if a patient is unable to shrug their shoulders symmetrically, there may be a lesion at what CN?

CN XI, left

if a patient is unable to turn their head to the right against resistance (but the left is fine), what CN and what side is defective?

CN XI, right

if a patient is unable to turn their head to the left against resistance (but the right is fine), what CN and what side is defective?

CN XII, right

if a patient is asked to stick out their tongue, and it deviates to the right, which CN and what side is defective?

CN XII, left

if a patient is asked to stick out their tongue, and it deviates to the left, which CN and what side is defective?