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 A
Explanation
Choice a reason:
The tympanic membrane, also known as the eardrum, is a critical component of the middle ear. It is a thin membrane that separates the external ear from the middle ear and vibrates in response to sound waves. These vibrations are then transmitted to the ossicles within the middle ear, which amplify and carry the sound to the inner ear.
Choice b reason:
The ear lobe is part of the external ear, not the middle ear. It is composed of soft skin and fatty tissue and does not play a role in hearing. The ear lobe serves primarily as a site for body decoration such as earrings.
Choice c reason:
The cochlea is a structure located in the inner ear. It is a spiral-shaped organ that contains the organ of Corti, the sensory organ of hearing. The cochlea converts the mechanical vibrations from the middle ear into nerve impulses that are sent to the brain.
Choice d reason:
The pinna, or auricle, is the visible part of the external ear. It is made of cartilage and skin and functions to capture sound waves and direct them into the ear canal towards the tympanic membrane.
Correct Answer is C
Explanation
Choice A Reason:
Family History is used to document health events in the patient's family, including diseases that may be hereditary or place the patient at risk. The statement about feeling like an elephant is sitting on the chest is not related to family health but is a description of the patient's current symptoms.
Choice B Reason:
Past Medical History includes information about the patient's past health issues, surgeries, hospitalizations, allergies, and treatments. It does not include current symptoms or the reasons for the current hospital visit.
Choice C Reason:
The Chief Complaint is the section where the nurse documents the primary reason for the patient's visit in their own words. The phrase "feels like an elephant is sitting on his chest" is a classic description of chest pain or discomfort, often associated with cardiac issues, and would be documented here as it represents the patient's main concern.
Choice D Reason:
Present Illness or History of Present Illness would include a detailed account of the development of the patient's illness or health concern. While it is closely related to the Chief Complaint, it is more detailed and includes the onset, duration, and character of the symptoms, among other aspects. The initial statement would be part of the Chief Complaint, which leads into the more detailed History of Present Illness.
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