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 C
Explanation
Choice a reason:
Getting a longer cord for the telephone may reduce the risk of tripping over a short cord but could potentially introduce new tripping hazards if not managed properly. It's important to keep cords secured and out of walkways to prevent falls.
Choice b reason:
Placing a throw rug over electrical cords is not advisable as it can create a tripping hazard. Rugs should be secured with non-slip backing and kept away from high-traffic areas to prevent falls.
Choice c reason:
Using handrails in the bathroom is a recommended safety measure to prevent falls. Bathrooms can be slippery, and handrails provide support and stability for residents when moving around in this area.
Choice d reason:
Using chairs without armrests is not a recommended practice for fall prevention. Chairs with armrests can aid residents in safely sitting down and standing up, providing support and reducing the risk of falls.
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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