c. Spinal accessory There are 12 pairs of cranial nerves present in the body. Accessory nerve is a 11th cranial nerve, motor (it divides into two parts. One part joins the vagus and supplies pharynx and larynx. The other part supplies sternomastoid and trapezius muscles of the neck). The axons of accessory nerve control the movements of head and neck through the medulla oblongata and pons. Solution c. Spinal accessory There are 12 pairs of cranial nerves present in the body. Accessory nerve is a 11th cranial nerve, motor (it divides into two parts. One part joins the vagus and supplies pharynx and larynx. The other part supplies sternomastoid and trapezius muscles of the neck). The axons of accessory nerve control the movements of head and neck through the medulla oblongata and pons..