He nurse is testing the function of CN XI. Which statement best describes the response the nurse should expect if this nerve is intact? The patient:
a. Demonstrates the ability to hear normal conversation.
b. Sticks out the tongue midline without tremors or deviation.
c. Follows an object with his or her eyes without nystagmus or strabismus.
d. Moves the head and shoulders against resistance with equal strength.
ANS: D
The following normal findings are expected when testing the spinal accessory nerve (CN XI): The patient's sternomastoid and trapezius muscles are equal in size; the person can forcibly rotate the head both ways against resistance applied to the side of the chin with equal strength; and the patient can shrug the shoulders against resistance with equal strength on both sides. Checking the patient's ability to hear normal conversation checks the function of CN VIII. Having the patient stick out the tongue checks the function of CN XII. Testing the eyes for nystagmus or strabismus is performed to check CNs III, IV, and VI.
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