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 C

Explanation

Choice a reason:
The left temporal bone would be the expected site of lateralization for sound in a Weber test if the patient had conductive hearing loss in the left ear. However, with unilateral sensorineural hearing loss, the sound typically lateralizes to the opposite ear, which is the ear with better hearing.
Choice b reason:
Lateralization to both ears equally during the Weber test would suggest either normal hearing or symmetrical hearing loss. In the case of unilateral sensorineural hearing loss, the sound is not perceived as equal in both ears because the affected ear does not hear as well as the unaffected ear.
Choice c reason:
In a patient with unilateral sensorineural hearing loss in the left ear, the Weber test will lateralize to the right ear, which is the ear with normal hearing. This occurs because the inner ear on the affected side is not able to transmit the sound as effectively as the unaffected side, making the sound seem louder in the ear with better hearing.
Choice d reason:
Lateralization to the left ear in the Weber test would indicate conductive hearing loss in the left ear, not sensorineural hearing loss. In sensorineural hearing loss, the sound vibrates to the ear with better cochlear function, which would be the right ear in this case.

A. Tracheal B. Vesicular C. Bronchovesicular D. Bronchial

Correct Answer is B

Explanation

Choice A Reason:
Tracheal sounds are harsh, high-pitched breath sounds typically heard over the trachea in the neck. They are not expected to be heard over the peripheral lung fields of a young adult during a routine lung auscultation.

Choice B Reason:
Vesicular breath sounds are the normal sounds heard over most of the lung fields. They are characterized by a soft, low-pitched, rustling sound during inhalation and are softer during exhalation. These sounds are created by air moving through the smaller airways such as the bronchioles and alveoli.

Choice C Reason:
Bronchovesicular sounds are heard over the major bronchi and are characterized by a moderate pitch and intensity. They are typically heard between the first and second intercostal spaces at the sternal border anteriorly and between the scapulae posteriorly, not over most of the lung fields.

Choice D Reason:
Bronchial breath sounds are high-pitched and louder than vesicular sounds, with a hollow quality, and are normally heard over the manubrium. If heard over the peripheral lung fields, they may indicate lung consolidation or other abnormalities.

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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

A patient is diagnosed with left ear unilateral sensorineural hearing loss. During the performance of the Weber test, the nurse expects lateralization of the sound/vibration to the:

Correct Answer is C

Explanation

The nurse is preparing to auscultate the lung sounds of a young adult. Which sound will the nurse expect to hear over most of the client's lungs?

Correct Answer is B

Explanation

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