What cranial nerve is responsible for the taste sensation of the posterior third of the tongue?

Facial

Abducens

Glossopharyngeal

Hypoglossal

Answer and Explanation

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.

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Correct Answer is B

Explanation

Choice a reason:
A client recently diagnosed with a chronic illness would require a comprehensive health history that includes past medical history, medications, and lifestyle factors. While important, it is not typically categorized as an emergency health history unless the chronic condition has acutely worsened.

Choice b reason:
A client presenting with hypotension (low blood pressure), tachycardia (rapid heart rate), an oxygen saturation of 85% (indicating potential hypoxemia), and a recent gunshot wound is experiencing a life-threatening situation that requires immediate medical attention. An Emergency health history is crucial in this scenario to quickly gather information that will guide urgent treatment decisions.

Choice c reason:
A client who has just confirmed pregnancy would need a detailed health history, including obstetric and gynecological history, but this is not considered an emergency unless there are complications or concerns that require immediate attention.

Choice d reason:
A client who frequently visits the hospital reporting the same symptom may indicate a chronic issue that needs ongoing management rather than an emergency. However, if the symptom suggests an acute exacerbation or a new, serious condition, it could escalate to an emergency.

A. Penlight B. Gloves C. Gauze pad D. Tongue blade

Correct Answer is C

Explanation

Choice a reason:
A penlight is used to provide illumination during an examination, not to move the tongue. It helps the nurse to visualize the mouth floor and other areas by casting light, but it does not have the physical structure to manipulate the tongue.

Choice b reason:
Gloves are worn by healthcare professionals to maintain hygiene and protect both the patient and the nurse from the transmission of infectious agents. They are not used to move the tongue to one side during an examination.

Choice c reason:
A gauze pad is the correct tool to use when the nurse needs to move the tongue to one side during an examination of the mouth floor. The nurse can wrap the gauze pad around the tongue for a better grip, which allows for safe and effective retraction of the tongue without causing discomfort to the patient.

Choice d reason:
A tongue blade, also known as a tongue depressor, is typically used to depress the tongue to examine the back of the throat, not to move the tongue to one side. It is used to hold the tongue down so that the nurse can inspect the oropharynx and other structures.

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What cranial nerve is responsible for the taste sensation of the posterior third of the tongue?

Nursing Test Bank

Naxlex Comprehensive Predictor Exams

The student nurse is reviewing different types of health history. Which client situation would require an Emergency health history?

Correct Answer is B

Explanation

The nurse is preparing to examine a client's mouth floor. To move the tongue to one side for this examination, which tool should the nurse use?

Correct Answer is C

Explanation

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