What cranial nerve is responsible for the taste sensation of the posterior third of the tongue?
Facial
Abducens
Glossopharyngeal
Hypoglossal
The Correct Answer is C
Choice A Reason:
The facial nerve, or cranial nerve VII, is responsible for the taste sensation in the anterior two-thirds of the tongue, not the posterior third. It carries taste sensations from the front part of the tongue via the chorda tympani branch.
Choice B Reason:
The abducens nerve, or cranial nerve VI, has no role in taste sensation. It is primarily involved in controlling the lateral rectus muscle of the eye, which abducts the eye.
Choice C Reason:
The glossopharyngeal nerve, or cranial nerve IX, provides special sensory innervation for taste to the posterior third of the tongue. This enables the sensation of various tastes like salty, sweet, sour, and bitter in this region.
Choice D Reason:
The hypoglossal nerve, or cranial nerve XII, is responsible for motor control of the tongue muscles but does not provide sensory innervation for taste.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
Choice A Reason:
Looking down does not typically expose the sclera and conjunctiva for examination. The lower eyelid covers more of the sclera when the eyes are directed downward, making it less accessible for observation.
Choice B Reason:
Moving the eyes to the left is not the standard direction for examining the sclera and conjunctiva. This movement would not provide an optimal view of the entire sclera and conjunctiva, as it would only stretch the lateral part of the conjunctiva.
Choice C Reason:
Directing the eyes to the right, similar to moving them to the left, does not offer the best exposure for examining the sclera and conjunctiva. The medial part of the conjunctiva would be stretched, but the rest would not be easily visible.
Choice D Reason:
Instructing the client to look up is the correct procedure when examining the sclera and conjunctiva. By looking upward, the client exposes more of the sclera and the palpebral conjunctiva, allowing the nurse to inspect these areas thoroughly for any abnormalities such as redness, swelling, or foreign bodies.
Correct Answer is D
Explanation
Choice a reason:
Bronchovesicular sounds are normal breath sounds heard over the main bronchus area and over the upper right posterior lung field. They have a medium pitch and intensity and are heard on both inspiration and expiration. Bronchovesicular sounds do not involve the change of vowel sounds during auscultation.
Choice b reason:
Bronchophony is the term used when the voice sounds are more clear and louder over the chest wall, usually indicating lung consolidation. However, it does not specifically refer to the change of vowel sounds from "ee" to "ay."
Choice c reason:
Normal voice resonance is when voice sounds heard through auscultation are muffled and indistinct. It does not involve a clear change in vowel sounds, which is what occurs with egophony.
Choice d reason:
Egophony is characterized by the change of the "ee" vowel sound to a nasal "ay" or "a" sound when auscultating the lungs. This phenomenon typically suggests lung consolidation, as might be seen with pneumonia.
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