The advanced practice registered nurse (APRN) is assessing the cranial nerves during a physical examination. Which tool will the APRN use to test cranial nerve II (CN2)?
Alcohol prep
Cotton swab
Snellen chart
Tuning fork
The Correct Answer is C
A. Alcohol prep is incorrect because it is primarily used for disinfection of the skin before procedures or injections. While essential for infection control, it does not provide any information about cranial nerve function, including visual acuity or optic nerve integrity.
B. Cotton swab is incorrect because it is used to assess sensory function, such as testing light touch or pain sensation of the face for cranial nerve V (trigeminal nerve). Cotton swabs can also be used for testing corneal reflexes, but they do not evaluate vision, so they are not appropriate for testing cranial nerve II.
C. Snellen chart is correct because cranial nerve II (optic nerve) is responsible for vision, specifically visual acuity. The Snellen chart provides a standardized method for evaluating clarity and sharpness of vision at a distance. During the assessment, the APRN asks the patient to cover one eye at a time and read letters of decreasing size from a set distance (usually 20 feet or 6 meters). This assessment helps identify reduced visual acuity, refractive errors, or optic nerve pathology. Testing each eye individually allows detection of unilateral vision deficits, which can indicate localized optic nerve damage, retinal disease, or neurological conditions affecting vision.
D. Tuning fork is incorrect because it is used to assess hearing (cranial nerve VIII) or vibratory sensation in peripheral nerves, not visual function. While important in other neurological assessments, a tuning fork does not evaluate optic nerve function or visual acuity.
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Related Questions
Correct Answer is ["A","D"]
Explanation
A. Kernig sign is correct because it assesses meningeal irritation. The APRN flexes the patient’s hip and knee to 90° and then attempts to extend the knee. Pain or resistance in the hamstrings during this maneuver is a positive Kernig sign, suggestive of meningeal inflammation, commonly seen in meningitis.
B. Murphy’s sign is incorrect because it is used to assess cholecystitis. Pain and inspiratory arrest upon palpation of the right upper quadrant occurs during Murphy’s test, which is unrelated to meningeal inflammation.
C. Trendelenburg sign is incorrect because it assesses hip abductor muscle weakness, particularly in gluteus medius or minimus weakness, often associated with hip disorders. It does not assess meningeal irritation.
D. Brudzinski sign is correct because it also evaluates meningeal irritation. When the APRN flexes the patient’s neck forward, involuntary hip and knee flexion indicates a positive Brudzinski sign, which is highly suggestive of meningitis.
Correct Answer is B
Explanation
A. Flashlight is incorrect because it is primarily used to assess pupillary reactions (cranial nerves II and III) or to inspect the oral cavity. While a flashlight helps with visual inspection and pupil response testing, it does not evaluate the sensory or motor functions of the trigeminal nerve, which are essential for diagnosing its injury.
B. Cotton swab is correct because the trigeminal nerve has both sensory and motor components. The sensory function is responsible for facial sensation across three divisions: ophthalmic, maxillary, and mandibular. The APRN uses a cotton swab to lightly touch different regions of the face, including the forehead, cheeks, and jawline, to assess the patient’s ability to feel light touch. The motor function controls the muscles of mastication, which are essential for chewing. The APRN can assess this by asking the patient to clench their teeth, move the jaw from side to side, or resist jaw opening. Using both observations helps identify trigeminal nerve injury, which may manifest as loss of facial sensation, weakness in jaw movement, or difficulty chewing.
C. Snellen chart is incorrect because it is used to assess visual acuity, which evaluates cranial nerve II (optic nerve). It provides no information about facial sensation or the ability to chew, so it is not appropriate for trigeminal nerve assessment.
D. Tuning fork is incorrect because it is used to assess hearing (cranial nerve VIII) or vibratory sensation in peripheral nerves. While useful in other neurological assessments, it does not provide data on trigeminal nerve function, either sensory or motor.
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