MRCP UK EXAMINATIONS

Detailed explanation-1: -Examination of the accessory nerve involves assessing two muscles: the trapezius and sternocleidomastoid. When assessing the trapezius, ask the patient to shrug their shoulders, then apply resistance. Accessory nerve weakness will present with weak or no resistance to your downward force.

Detailed explanation-2: -This nerve supplies the sternocleidomastoid and trapezius muscles, which have the following functions: Rotation of head away from the side of the contracting sternocleidomastoid muscle. Tilting of the head toward the contracting sternocleidomastoid muscle.

Detailed explanation-3: -The muscles innervated directly by the XI nerve are the trapezius and the sternocleidomastoid, in addition to the laryngeal musculature (in collaboration with the vagus nerve), such as the palatal, pharyngeal, laryngeal muscles.

Detailed explanation-4: -The trapezius is innervated for motor functions by the spinal accessory nerve (cranial nerve XI).