The nurse is reviewing the function of the cranial nerves (CNS). Which CN is responsible for conducting nerve impulses to the brain for hearing?
VIII
VI
V
VII
The Correct Answer is A
A. VIII: Cranial nerve VIII, also known as the vestibulocochlear nerve, is responsible for transmitting auditory information from the cochlea of the inner ear to the brain, allowing for the perception of sound. It also plays a role in balance by carrying information from the vestibular apparatus regarding head position and movement.
B. VI: Cranial nerve VI, the abducens nerve, controls the lateral rectus muscle, which is responsible for outward eye movement. It does not have any function related to hearing.
C. V: Cranial nerve V, the trigeminal nerve, is primarily responsible for sensation in the face and motor functions such as biting and chewing. It does not conduct nerve impulses related to hearing.
D. VII: Cranial nerve VII, the facial nerve, controls muscles of facial expression and carries taste sensations from the anterior two-thirds of the tongue. While it has some minor roles in the auditory system (such as innervating the stapedius muscle), it is not primarily responsible for conducting nerve impulses related to hearing.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
A. Is impaired in a patient with cataracts: Cataracts primarily cause lens opacity, leading to blurry vision and reduced acuity. They do not directly affect extraocular muscle function, which is controlled by cranial nerves rather than the lens.
B. Is always decreased in the older adult: Aging can cause minor changes in eye movement speed and coordination, but significant impairment is not inevitable. Extraocular muscle function remains intact unless affected by neurological conditions such as cranial nerve palsy.
C. Is stimulated by cranial nerves (CNS) I and II: Cranial nerve I (olfactory) is responsible for smell, and cranial nerve II (optic) transmits visual signals to the brain. Neither nerve controls eye movement, which is instead governed by different cranial nerves.
D. Is stimulated by cranial nerves III, IV, and VI: The oculomotor (III), trochlear (IV), and abducens (VI) nerves control extraocular muscle movement. They coordinate eye positioning, alignment, and smooth tracking, ensuring proper function of the visual system.
Correct Answer is B
Explanation
A. I: Cranial nerve I, the olfactory nerve, is responsible for the sense of smell and is not involved in visual acuity; it can be tested by asking the patient to identify familiar scents.
B. II: Cranial nerve II, the optic nerve, is responsible for transmitting visual information from the retina to the brain. It is directly involved in measuring visual acuity, as it enables the nurse to assess how well the patient can see and interpret visual stimuli; visual acuity is commonly tested using the Snellen chart.
C. IV: Cranial nerve IV, the trochlear nerve, controls the superior oblique muscle, which is responsible for downward and lateral eye movement. It can be assessed by having the patient follow an object in a downward diagonal direction.
D. III: Cranial nerve III, the oculomotor nerve, controls most of the eye's movements, including constriction of the pupil and maintaining an open eyelid. It is assessed by evaluating the patient's ability to follow objects in all directions and checking for pupil response to light and accommodation.
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