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:
Educational Prevention is not a recognized level of prevention in healthcare. While education is a key component in all levels of prevention, it is not a standalone category. Education is typically included in primary prevention as it involves informing the public about health practices to prevent the onset of disease.

Choice b reason:
Tertiary Prevention is the level of prevention that aims to manage and treat an existing disease to prevent further complications or deterioration. In the case of immobile stroke patients, tertiary prevention would involve measures to prevent skin breakdown and other complications associated with immobility and the stroke's long-term effects.

Choice c reason:
Secondary Prevention involves early detection and prompt intervention to prevent the progression of a disease. For stroke patients, secondary prevention might include monitoring for signs of skin breakdown so that early treatment can be initiated. However, the scenario described focuses on managing an existing condition rather than early detection.

Choice d reason:
Primary Prevention aims to prevent the disease or injury before it occurs. This would involve strategies to prevent strokes in the first place, such as controlling high blood pressure or encouraging healthy lifestyle changes. It does not directly relate to the prevention of skin breakdown in patients who have already had a stroke.

A. Resonance B. Tympanic C. Flat D. Dullness

Correct Answer is A

Explanation

Choice a reason:
Resonance is the expected percussion note when percussing over normal, healthy lung tissue. This sound is produced due to the presence of air in the lung parenchyma, which allows for the transmission of sound waves through the air-filled spaces. In a healthy individual, the resonance indicates that the lungs are free from any significant abnormalities that could alter the sound, such as fluid or solid masses.
Choice b reason:
Tympanic notes are typically heard over hollow, air-containing structures like the stomach. This sound is not expected in lung percussion unless there is a large, air-filled cavity within the lung tissue, which would be abnormal and indicative of a pathological condition such as a pneumothorax.
Choice c reason:
A flat percussion note is usually heard over dense tissues where air is not present, such as over the thigh muscles or areas of the chest where lung tissue has been replaced by something more solid, like in the case of a pleural effusion or a lung mass.
Choice d reason:
Dullness on percussion usually indicates that the lung is not air-filled and may be suggestive of underlying conditions such as pneumonia, tumor, or atelectasis. It is a higher-pitched sound compared to flatness and is typically found in areas of the lung that are filled with fluid or solid tissue rather than air.

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

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Naxlex Comprehensive Predictor Exams

A nurse educator is presenting at a continuing education seminar for nurses. As part of his presentation, he is emphasizing the prevention of skin breakdown in immobile patients who have suffered from a stroke. The level of prevention being discussed by the nurse educator is:

Correct Answer is B

Explanation

A nurse is performing a respiratory physical examination on a healthy patient. When performing the percussion physical assessment technique, the lung percussion note should be:

Correct Answer is A

Explanation

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