The six (6) eye muscles that control eye movement are innervated by cranial nerves:
I, II, V.
III, IV, VI.
III, V, XI.
II, V, VI. .
The Correct Answer is B
Choice A rationale
Cranial nerve I (olfactory) is responsible for smell, and cranial nerve II (optic) is responsible for vision. Cranial nerve V (trigeminal) is involved in facial sensation and mastication. These nerves are not primarily involved in controlling the extrinsic eye muscles responsible for eye movement.
Choice B rationale
Cranial nerve III (oculomotor) innervates the superior, inferior, and medial recti, and the inferior oblique muscles, and controls eyelid elevation. Cranial nerve IV (trochlear) innervates the superior oblique muscle. Cranial nerve VI (abducens) innervates the lateral rectus muscle. Together, these three cranial nerves precisely coordinate all six extraocular muscles for conjugate gaze.
Choice C rationale
While cranial nerve III (oculomotor) is correctly identified, cranial nerve V (trigeminal) and cranial nerve XI (accessory) are not primarily involved in eye movement. Cranial nerve V is involved in facial sensation and mastication, and cranial nerve XI innervates the sternocleidomastoid and trapezius muscles for head and shoulder movement.
Choice D rationale
Cranial nerve II (optic) is responsible for vision, transmitting visual information from the retina to the brain. Cranial nerve V (trigeminal) is involved in facial sensation and chewing. Cranial nerve VI (abducens) is correctly identified as innervating the lateral rectus, but the other two nerves listed do not control the majority of eye movements.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
Choice A rationale
Placing the patch in the same location repeatedly can lead to skin irritation, reduced absorption due to stratum corneum thickening, and localized adverse reactions. Rotation of application sites allows the skin to recover, maintains optimal drug absorption, and prevents cumulative dermal irritation.
Choice B rationale
Transdermal patches often contain significant amounts of medication, including controlled substances or potent drugs. Discarding them in the trash can poses risks of accidental exposure to others, environmental contamination, and diversion. Proper disposal protocols, such as flushing or returning to pharmacy, are crucial.
Choice C rationale
While transdermal patches are designed for systemic absorption, specific sites are recommended to optimize efficacy and minimize adverse effects. Areas with less hair, intact skin, and good circulation are preferred. Improper placement can lead to erratic absorption or local irritation, reducing therapeutic benefit.
Choice D rationale
The nurse should always wear gloves when handling transdermal patches to prevent direct skin contact with the medication. Many transdermal drugs can be absorbed through the nurse's skin, leading to unintended pharmacological effects or sensitization. Gloves provide a crucial barrier against dermal absorption.
Correct Answer is A
Explanation
Choice A rationale
A tuning fork is a U-shaped instrument that, when struck, produces a specific frequency of vibration. In audiology, it is used to assess both air conduction (sound transmitted through the external and middle ear to the inner ear) and bone conduction (sound transmitted directly to the inner ear through the skull), aiding in differentiating types of hearing loss.
Choice B rationale
A penlight is a small, handheld light source primarily used for illuminating body cavities, assessing pupillary reflexes, or examining the oral cavity and throat. It does not produce sound vibrations and is not used for measuring air or bone conduction in the ear.
Choice C rationale
A reflex hammer is an instrument used to elicit deep tendon reflexes by tapping on tendons, stretching the muscle, and activating the reflex arc. It is a neurological assessment tool and has no function in measuring auditory conduction.
Choice D rationale
An otoscope is a medical device equipped with a light and magnifying lens, used for visual examination of the external ear canal and tympanic membrane (eardrum). While essential for ear assessment, it does not measure air or bone conduction; rather, it allows for direct visualization of anatomical structures.
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