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:
The dorsal aspect of the hand, rather than the finger pads, is more sensitive to temperature due to its thinner skin. Therefore, while the finger pads can detect temperature, they are not the best tool for this purpose.
Choice B Reason:
Vibrations, such as those produced by vocal fremitus, are typically assessed using the ulnar edge or the palmar aspect of the hand, not the finger pads. The finger pads are sensitive but do not provide the best surface for detecting vibrations.
Choice C Reason:
The finger pads are densely innervated and are the most sensitive part of the hand, making them ideal for palpating pulses. Pulses are subtle and require a fine touch to assess properly, which is why the finger pads are the preferred area for this assessment.
Choice D Reason:
Fremitus refers to the palpable vibrations transmitted through the bronchopulmonary tree to the chest wall as someone speaks. It is best felt with the ball of the hand or the ulnar edge, not the finger pads.
Correct Answer is C
Explanation
Choice A Reason:
Positioning the arm below waist level is not recommended when measuring blood pressure. It can result in an inaccurate reading, typically showing a higher blood pressure due to the effects of gravity on the blood column. The arm should be positioned at heart level for an accurate measurement.
Choice B Reason:
While palpating the radial artery to confirm a pulse is present is part of the overall assessment of circulation, it is not a necessary step immediately before measuring blood pressure. The focus should be on ensuring the client is in the correct position and is relaxed to avoid any factors that might artificially alter the blood pressure reading.
Choice C Reason:
Asking the client to sit quietly in a chair for 5 minutes is the correct procedure before measuring blood pressure. This allows the client's heart rate and blood pressure to stabilize, providing a more accurate measurement. Any activity or stress can temporarily raise blood pressure, so this quiet time is crucial.
Choice D Reason:
The arm selected for blood pressure measurement should not be covered with clothing. Clothing can constrict the blood pressure cuff and interfere with the accuracy of the reading. The cuff should be placed on bare skin to ensure it inflates and deflates correctly and that the stethoscope can accurately detect the sounds of the blood flow.
Whether you are a student looking to ace your exams or a practicing nurse seeking to enhance your expertise , our nursing education contents will empower you with the confidence and competence to make a difference in the lives of patients and become a respected leader in the healthcare field.
Visit Naxlex, invest in your future and unlock endless possibilities with our unparalleled nursing education contents today