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:
While falls are a common cause of injury in children, they are not the leading cause of TBI in adolescents. Falls tend to be more frequent in the younger population, particularly in children under the age of 4. In adolescents, sports-related injuries and motor vehicle accidents are more prevalent causes of TBI.
Choice B Reason:
The statement that females have twice the risk of TBI compared to males is incorrect. National data reveal that males are at increased risk of TBI compared to females, especially in the adolescent age group. This is likely due to higher engagement in risk-taking behaviors and contact sports.
Choice C Reason:
Concussions in sports and motor vehicle accidents are indeed the leading causes of TBI in adolescents. Engaging in contact sports such as football, hockey, and soccer can lead to concussions, which are a form of mild TBI. Motor vehicle accidents are also a significant risk factor due to high-impact collisions that can cause head injuries.
Choice D Reason:
Firearm incidents are a serious concern for TBI; however, they are not the most common cause of TBI in adolescents. While firearm-related injuries can be severe and are a leading cause of TBI-related deaths, concussions from sports and motor vehicle accidents account for a larger number of non-fatal TBIs in this age group.
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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