(D) The spinal accessory nerve (cranial nerve $XI$) is a purely motor nerve.It arises from the side of the medulla oblongata and supplies the muscles

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(D) The spinal accessory nerve (cranial nerve $XI$) is a purely motor nerve.It arises from the side of the medulla oblongata and supplies the muscles of the pharynx,larynx,neck,and shoulder.In contrast,the facial nerve,vagus nerve,and trigeminal nerve are mixed nerves,containing both sensory and motor fibers.