A nurse is assessing a client’s cranial nerves. What cranial nerve would be assessed when checking a client’s gag reflex?
CN IX
CN V
CN X
CN XII
The Correct Answer is A
Choice A reason: The glossopharyngeal nerve (CN IX) is primarily responsible for the gag reflex. It provides sensory input from the pharynx and posterior third of the tongue, which triggers the gag reflex when stimulated. This nerve plays a crucial role in swallowing and the reflexive action to prevent choking.
Choice B reason: The trigeminal nerve (CN V) is responsible for facial sensation and motor functions such as biting and chewing. It does not play a direct role in the gag reflex. While it is important for other sensory and motor functions, it is not involved in the reflex being assessed here.
Choice C reason: The vagus nerve (CN X) also contributes to the gag reflex by providing motor innervation to the muscles of the pharynx and larynx. However, the primary sensory input for the gag reflex comes from the glossopharyngeal nerve (CN IX). The vagus nerve works in conjunction with CN IX to complete the reflex action.
Choice D reason: The hypoglossal nerve (CN XII) controls the movements of the tongue. It is essential for speech and swallowing but does not have a role in the gag reflex. The hypoglossal nerve’s primary function is motor control of the tongue muscles.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
Choice A reason: Thrombophlebitis is characterized by inflammation of the vein with the formation of a blood clot. The signs and symptoms include erythema, warmth, edema, and a red line traveling up the vessel, which indicates the presence of inflammation and possible clot formation. This condition requires prompt intervention to prevent further complications such as the spread of infection or the clot traveling to other parts of the body.
Choice B reason: Infiltration occurs when IV fluid or medication leaks into the surrounding tissue. Signs of infiltration include swelling, discomfort, and coolness at the IV site, but it does not typically present with erythema, warmth, or a red line traveling up the vessel. Infiltration is less likely to cause the systemic signs seen in this case.
Choice C reason: Infection at the IV site can cause erythema, warmth, and edema, but it usually does not present with a red line traveling up the vessel. The red line is more indicative of thrombophlebitis, where the inflammation follows the path of the vein. Infection would also likely present with additional systemic signs such as fever.
Choice D reason: Extravasation involves the leakage of vesicant drugs into the surrounding tissue, causing severe local tissue damage. Signs include pain, burning, and blistering at the site, but it does not typically present with a red line traveling up the vessel. Extravasation is more localized and does not follow the vein’s path like thrombophlebitis.
Correct Answer is C
Explanation
Choice A Reason:
The gastrocnemius muscle, located in the calf, is not a recommended site for intramuscular injections in newborns. This muscle is not typically used due to its small size and the difficulty in accessing it safely for an injection.
Choice B Reason:
The dorsogluteal muscle, located in the buttocks, is also not recommended for newborns. This site is avoided because of the risk of damaging the sciatic nerve and the relatively thick layer of subcutaneous fat, which can interfere with the absorption of the medication.
Choice C Reason:
The vastus lateralis muscle, located in the thigh, is the preferred site for intramuscular injections in newborns. This muscle is well-developed at birth and provides a large, easily accessible area for injections. It is also away from major blood vessels and nerves, making it a safe and effective site for administering medications like vitamin K.
Choice D Reason:
The ventrogluteal muscle, located on the side of the hip, is another site used for intramuscular injections, but it is not typically recommended for newborns. This site is more commonly used in older children and adults due to its deeper location and the need for precise anatomical knowledge to avoid complications.
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