During an assessment of the cranial nerves, a client reports spontaneously losing balance. The nurse should focus additional assessment on which cranial nerve?
V
VII
I
VIII
The Correct Answer is D
A. The trigeminal nerve (CN V) is primarily responsible for sensation in the face and the motor control of the muscles used for chewing. It does not have a role in balance or equilibrium, so it would not be the focus when assessing balance issues.
B. The facial nerve (CN VII) controls the muscles of facial expression and provides taste sensation to the anterior two-thirds of the tongue. While it plays a significant role in facial movement and taste, it is not involved in balance or equilibrium.
C. The olfactory nerve (CN I) is responsible for the sense of smell. It does not have any role in balance or equilibrium. Balance issues are not related to the olfactory nerve, so this is not the appropriate focus for balance assessment.
D. The vestibulocochlear nerve (CN VIII) has two major components: the cochlear nerve, which is responsible for hearing, and the vestibular nerve, which is responsible for balance and equilibrium. The vestibular component of CN VIII is crucial for maintaining balance and spatial orientation. When a client reports spontaneous loss of balance, this nerve should be the focus of additional assessment.
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Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
A. The soft palate should move during phonation. If it remains stationary, it could indicate a problem with cranial nerves IX and X. These nerves control the movement of the soft palate and the muscles involved in phonation.
B. This is the normal finding. During the assessment, when the patient says "ah," the uvula and soft palate should rise symmetrically. This movement indicates that cranial nerves IX and X are functioning properly. If the uvula and soft palate rise bilaterally, it means that both sides of the soft palate are being controlled correctly by these nerves.
C. Asymmetry in the soft palate could indicate dysfunction of cranial nerves IX and X. Normally, the soft palate should rise evenly on both sides when the patient says "ah." An asymmetrical soft palate suggests that one side is not functioning correctly, which may be due to nerve damage or weakness.
D. This is not a normal finding. If the uvula deviates to one side when the patient says "ah," it indicates a problem with the function of the cranial nerves. The deviation is usually towards the side opposite to the weak or affected side. This asymmetry in uvula movement can be due to a weakness or paralysis of the muscles on one side controlled by these nerves.
Correct Answer is C
Explanation
A. The trigeminal nerve (CN V) is primarily responsible for sensory information from the face and motor control of the muscles of mastication (chewing). It does not carry taste sensations. Instead, it is involved in sensation (e.g., touch, pain, temperature) of the face and mouth, but not taste.
B. The vagus nerve (CN X) has various functions, including parasympathetic control of the heart, lungs, and digestive tract, and sensory and motor functions in the throat and voice box. It does contribute to taste sensation in the region of the pharynx and the epiglottis, but it is not primarily responsible for the taste sensation on the posterior third of the tongue.
C. The glossopharyngeal nerve (CN IX) is responsible for taste sensation on the posterior one-third of the tongue. It also contributes to the sensory innervation of the pharynx and helps in the regulation of saliva production. This nerve is specifically involved in the taste perception in the back third of the tongue.
D. The facial nerve (CN VII) provides taste sensation to the anterior two-thirds of the tongue. It also controls the muscles of facial expression and contributes to the production of saliva and tears. The facial nerve does not provide taste sensation to the posterior third of the tongue.
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