Which cranial nerves are involved in eye movements? Select all that apply.
Trochlear
Optic
Oculomotor
Abducens
Facial
Correct Answer : A,C,D
A) Trochlear: The trochlear nerve (CN IV) is responsible for innervating the superior oblique muscle, which helps control the downward and inward movement of the eye.
B) Optic: The optic nerve (CN II) is primarily involved in vision and visual acuity, not in the movement of the eye. It transmits visual information from the retina to the brain.
C) Oculomotor: The oculomotor nerve (CN III) controls most of the extraocular muscles, including those responsible for eye movement (superior rectus, inferior rectus, medial rectus, and inferior oblique) and also controls pupil constriction.
D) Abducens: The abducens nerve (CN VI) controls the lateral rectus muscle, which is responsible for the outward movement of the eye.
E) Facial: The facial nerve (CN VII) controls the muscles of facial expression and is not involved in eye movements.
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Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
A) The tricuspid area: The tricuspid area is located at the lower left sternal border, around the 4th or 5th intercostal space. It is where the tricuspid valve sounds are best heard, not the area for auscultating the 2nd rib space.
B) Erb's point: Erb's point is located at the left sternal border in the 3rd intercostal space. It is a key area for auscultating both the aortic and pulmonic valves, as well as the mitral and tricuspid valves, but it is not associated with the right 2nd rib space.
C) The mitral area: The mitral area, also known as the mitral valve area, is located at the 5th intercostal space at the midclavicular line on the left side. This area is used for auscultating the mitral valve, not the right 2nd rib space.
D) The aortic area: The right 2nd rib space, also known as the 2nd intercostal space at the right sternal border, is the location where the aortic valve sounds are best auscultated. This area is used to listen to the aortic valve's closure and is the first location for cardiac auscultation.
Correct Answer is ["A","C","D"]
Explanation
A. Weber test: The Weber test is used to assess hearing by placing a vibrating tuning fork on the center of the forehead. It helps evaluate lateralization of sound and can indicate whether hearing loss is conductive or sensorineural. This test is pertinent for assessing CN VIII, which is responsible for hearing.
B. Magazine: This option is not relevant to the assessment of CN VIII. A magazine is not used in evaluating hearing or vestibular function. The appropriate assessments for CN VIII focus on hearing and balance.
C. Rinne test: The Rinne test involves placing a vibrating tuning fork on the mastoid bone and then near the ear canal to compare air conduction (AC) and bone conduction (BC) of sound. This test helps differentiate between conductive and sensorineural hearing loss and is directly related to assessing CN VIII.
D. Whispered voice test: This test involves the nurse whispering numbers or words while occluding one ear and assessing the client's ability to hear and repeat them. It is a simple way to assess hearing ability and thus evaluates the function of CN VIII.
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