The nurse continues a neurologic assessment of the cranial nerve XI (Spinal accessory) for a client. Which instruction should the nurse give the client to complete this assessment?

Choice A Reason: Shrug shoulders against resistance is correct because cranial nerve XI, also known as the spinal accessory nerve, innervates the trapezius and sternocleidomastoid muscles. Instructing the client to shrug their shoulders against resistance tests the strength and function of the trapezius muscle, which is primarily innervated by cranial nerve XI. Therefore, this instruction directly assesses the function of the cranial nerve XI. Choice B Reason: Stand up slowly with eyes closed is incorrect because standing up slowly with eyes closed primarily assesses proprioception and balance, which involve multiple cranial nerves and the vestibular system. While cranial nerve XI may play a role in maintaining posture and balance, it is not the primary nerve involved in this assessment. Choice C Reason: Turn head from side to side is incorrect because turning the head from side to side primarily assesses the function of the sternocleidomastoid muscle, which is also innervated by cranial nerve XI. However, this action alone does not provide resistance against which the muscle can contract, making it less specific for assessing cranial nerve XI compared to the instruction to shrug the shoulders against resistance. Choice D Reason: Raise both arms overhead incorrect because raising both arms overhead primarily assesses motor function and strength of the upper extremities, which do not directly involve the muscles innervated by cranial nerve XI. While the trapezius muscle may be indirectly involved in shoulder movement, this action does not specifically target the function of cranial nerve XI.