How do you test nerve accessory?
Examination. The accessory nerve is tested by evaluating the function of the trapezius and sternocleidomastoid muscles. The trapezius muscle is tested by asking the patient to shrug their shoulders with and without resistance.
Besides, how do you find the spinal accessory nerve?
The main identification point of the nerve is in the posterior triangle, behind the posterior edge of the sternocleidomastoid muscle at Erb's point, which is defined by the exit of the greater auricular nerve from behind the sternocleidomastoid muscle.