A nurse is assessing a client’s cranial nerves as part of a neurological examination. Which of the following actions should the nurse take to assess cranial nerve III?

Eliciting the gag reflex

Checking the pupillary response to light

Observing for facial symmetry

Testing visual acuity

Answer and Explanation

The Correct Answer is B

Choice A reason: Eliciting the gag reflex is not a valid way to assess cranial nerve III. The gag reflex is a protective mechanism that prevents choking or aspiration by triggering a contraction of the pharyngeal muscles when the back of the throat is stimulated. The gag reflex is mediated by cranial nerves IX and X, not III.

Choice B reason: Checking the pupillary response to light is a reliable way to assess cranial nerve III. The pupillary response to light is a reflex that causes the pupil to constrict when exposed to bright light and dilate when exposed to dim light. This reflex helps to regulate the amount of light that enters the eye and protects the retina from damage. The pupillary response to light is controlled by cranial nerve III, which innervates the sphincter pupillae muscle that constricts the pupil.

Choice C reason: Observing for facial symmetry is not a relevant way to assess cranial nerve III. Facial symmetry is the degree of similarity between the two halves of the face. Facial symmetry can be affected by various factors, such as genetics, aging, or facial nerve palsy. Facial nerve palsy is a condition that causes weakness or paralysis of the muscles that control facial expression. Facial nerve palsy is caused by damage to cranial nerve VII, not III.

Choice D reason: Testing visual acuity is not a sufficient way to assess cranial nerve III. Visual acuity is the ability to see fine details and distinguish objects at a distance. Visual acuity depends on various factors, such as the clarity of the lens and cornea, the shape of the eyeball, and the function of the retina. Visual acuity is mainly affected by cranial nerve II, which carries visual information from the retina to the brain. Cranial nerve III does not directly influence visual acuity, but it does innervate some of the muscles that move the eye and enable binocular vision.

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Correct Answer is C

Explanation

Choice A reason: Turning on the television for the client during meals is not a good idea, as it can distract the client from eating and swallowing properly, and increase the risk of choking or aspiration.

Choice B reason: Providing the client with oral hygiene is important, but it is not enough to prevent aspiration pneumonia. Oral hygiene can reduce the amount of bacteria in the mouth, but it does not prevent food or liquid from entering the airways.

Choice C reason: Elevating the head of the client’s bed to 45 degrees during meals is the best action to prevent aspiration pneumonia, as it helps the client swallow more easily and reduces the chance of food or liquid going into the lungs.

Choice D reason: Instructing the client to tilt their head back while swallowing is a dangerous action, as it can actually increase the risk of aspiration pneumonia. Tilting the head back can open the airway and allow food or liquid to enter the lungs instead of the esophagus.

A. Oral mucosa B. Conjunctivae C. Ear lobes D. Soles of the feet

Correct Answer is A

Explanation

Choice A reason: The oral mucosa is the most reliable indicator of central cyanosis because it reflects the oxygen saturation of the arterial blood. Central cyanosis occurs when the arterial blood has a low oxygen saturation due to a cardiopulmonary problem. The oral mucosa is less affected by peripheral factors such as temperature, vasoconstriction, or skin pigmentation.

Choice B reason: The conjunctivae are not a reliable indicator of central cyanosis because they can be affected by other conditions such as anemia, jaundice, or eye infections. The conjunctivae are the thin membranes that cover the white part of the eye and the inner surface of the eyelids.

Choice C reason: The ear lobes are not a reliable indicator of central cyanosis because they can be affected by peripheral factors such as temperature, vasoconstriction, or skin pigmentation. The ear lobes are the fleshy lower part of the external ear.

Choice D reason: The soles of the feet are not a reliable indicator of central cyanosis because they can be affected by peripheral factors such as temperature, vasoconstriction, or skin pigmentation. The soles of the feet are the bottom part of the feet.

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