Eleventh (Spinal Accessory) Cranial Nerve, Paralysis of C&P Exam Prep

Sternocleidomastoid (SCM) Muscle Strength Testing

What it measures: Motor function of the sternocleidomastoid muscle, which rotates the head to the contralateral side and flexes the neck. Weakness or paralysis reflects spinal accessory nerve dysfunction.

What to expect: The examiner will place a hand against your chin or cheek and ask you to turn your head against resistance. They will compare strength on both sides. They may also ask you to flex your neck forward against resistance. Expect manual muscle testing graded 0-5.

Pain considerations: If head rotation or neck flexion against resistance causes pain, state this clearly. Pain during functional testing is a relevant finding under M21-1 guidance and may affect the examiner's severity assessment.

Trapezius Muscle Strength Testing (Shoulder Shrug)

What it measures: Motor function of the upper trapezius, which elevates the shoulder and stabilizes the scapula. Loss of this function is a primary indicator of spinal accessory nerve paralysis under DC 8211.

What to expect: The examiner will ask you to shrug your shoulders while they press down on them to test resistance. They will compare side to side. They will also observe your shoulders at rest for asymmetry, drop, or wasting. Expect visual inspection and manual muscle testing.

Pain considerations: Shoulder shrugging and overhead activities can produce significant pain when the trapezius is denervated or weakened. Describe the exact pain location (neck, shoulder blade, upper back), character (sharp, burning, aching), severity (numeric scale), and how it limits your ability to raise your arm, carry objects, or maintain posture.

Scapular Position and Winging Assessment

What it measures: Visual and tactile assessment of scapular positioning. Trapezius weakness from CN XI palsy can cause lateral displacement, inferior rotation, and winging of the scapula, particularly visible when raising the arm.

What to expect: The examiner will observe your back from behind at rest and during arm movements (e.g., raising your arm forward or to the side). They may palpate the scapula to assess its position. This is an objective measure of functional nerve loss.

Pain considerations: Scapular winging can cause chronic aching in the neck, shoulder, and upper back due to compensatory muscle overuse. Describe this secondary pain burden to the examiner, including how it interrupts sleep or limits sustained activity.

Electromyography (EMG) and Nerve Conduction Study Review

What it measures: Electrical activity in the trapezius and SCM muscles. EMG can confirm denervation, partial reinnervation, or complete axonal loss, providing objective evidence of the degree of nerve damage.

What to expect: The examiner will review any existing EMG results in your record. If no prior EMG exists, they may or may not order one. Under M21-1, Part V, Subpart iii, 12.A.2.h, EMG is required unless sufficient clinical evidence already exists in the record.

Pain considerations: EMG testing itself can be uncomfortable. If you have a low pain threshold due to your condition, inform the technician beforehand.

30%

Complete paralysis of the eleventh cranial nerve (spinal accessory). Total loss of motor function of both the sternocleidomastoid and trapezius muscles. The veteran is unable to rotate the head against resistance, unable to shrug the shoulder on the affected side, and has complete denervation of these muscles. There is complete loss of voluntary motor function dependent upon these muscles.

From 38 CFR: 38 CFR 4.124a, DC 8211: 'Paralysis of: Complete - 30.' Note: Dependent upon loss of motor function of sternomastoid and trapezius muscles.

20%

Incomplete, severe paralysis of the eleventh cranial nerve. Substantially impaired, but not completely absent, motor function of the sternocleidomastoid and trapezius muscles. The veteran retains some residual movement but with marked weakness, significant atrophy, and major functional limitations in head rotation and shoulder elevation.

From 38 CFR: 38 CFR 4.124a, DC 8211: 'Incomplete, severe - 20.' Note: Dependent upon loss of motor function of sternomastoid and trapezius muscles. Substantially less impaired than complete paralysis but with major motor deficits.

10%

Incomplete, moderate paralysis of the eleventh cranial nerve. Mild to moderate weakness of the sternocleidomastoid and/or trapezius muscles with some functional limitation but substantially preserved motor function. The veteran can perform head rotation and shoulder elevation but with reduced strength and possible fatigue, pain, or discomfort.

From 38 CFR: 38 CFR 4.124a, DC 8211: 'Incomplete, moderate - 10.' Note: Dependent upon loss of motor function of sternomastoid and trapezius muscles.

Motor Weakness - Shoulder Shrug and Trapezius Function

How to describe it: Describe the specific functional limitations caused by trapezius weakness. For example: 'I cannot lift my right shoulder at all. I cannot carry a bag on my right shoulder because it slides off. I cannot lift items above my waist without my shoulder giving out.' Be specific about which activities you can no longer do or do with great difficulty.

Example: On my worst days, my right shoulder drops completely and I can barely lift my arm away from my side. I cannot hold anything heavier than a cup of coffee. My neck and shoulder blade ache constantly, and I have trouble turning my head to look over my right shoulder when driving.

Examiner listens for: Specific activity limitations tied to trapezius and SCM motor loss, bilateral comparison of function, whether symptoms are constant or episodic, and how long deficits have persisted.

Avoid: Do not say 'it's a little weak' if you truly cannot shrug your shoulder against any resistance. Report your actual functional experience on your most symptomatic days, not your best days.

Motor Weakness - Head and Neck Rotation (SCM Function)

How to describe it: Explain that you cannot rotate your head fully to one side, especially against resistance or when driving, exercising, or working. For example: 'I cannot turn my head to the left to check my blind spot when driving without pain and it gives out. My neck tires very quickly and trembles when I try to hold a position.'

Example: On a bad day, I cannot turn my head at all without significant pain and muscle fatigue. I have had to stop driving because I cannot safely check my blind spots. Trying to hold my head in a turned position for even a few seconds causes burning pain and my head returns forward on its own.

Examiner listens for: Whether the weakness affects both the SCM and trapezius or predominantly one, the degree to which the functional deficit limits work and daily activities, and the consistency and duration of symptoms.

Avoid: Do not demonstrate only your best performance during the exam. If your strength is much worse after activity or on certain days, say so explicitly: 'Right now I can shrug slightly but by the end of the day I cannot do it at all.'

Pain - Neck, Shoulder, and Upper Back

How to describe it: Describe the character (burning, aching, sharp, stabbing), location (neck base, shoulder blade, upper trapezius, radiating down the arm), severity (0-10 scale), frequency (constant vs. intermittent), and aggravating factors (sustained postures, lifting, turning the head, sleeping on the affected side).

Example: On my worst days, the pain in my left neck and shoulder blade is an 8 out of 10. It is a constant burning ache that spikes to sharp pain if I try to lift anything or turn my head. I cannot sleep on my left side. The pain wakes me up at night and I require prescription medication to get through the day.

Examiner listens for: Pain type (constant vs. intermittent vs. dull), severity rating, impact on sleep and ADLs, and whether pain is associated with the nerve injury or compensatory muscle overuse.

Avoid: Do not minimize pain because you are managing it with medication. Report your pain level as it would be WITHOUT medication, and also describe the pain you still experience WHILE on medication.

Paresthesias, Dysesthesias, and Numbness

How to describe it: Describe any abnormal sensations in the neck, posterior shoulder, or upper back including tingling, burning, electric-shock sensations, or numbness. Note whether these are constant or triggered by movement. For example: 'I have a persistent tingling and burning sensation along the left side of my neck that runs into my shoulder blade. It is always there but gets worse when I turn my head.'

Example: On a bad day, the left side of my neck and shoulder feel numb and tingly from the time I wake up. Any movement of my head makes the tingling turn into a sharp electric sensation. It is distracting at work and I cannot focus.

Examiner listens for: The anatomical distribution of sensory symptoms (within or outside the CN XI territory), consistency of symptoms, whether sensory findings correlate with motor findings, and severity ratings.

Avoid: Do not ignore sensory symptoms as 'not important' compared to weakness. Paresthesias and numbness are rated DBQ checkboxes that directly support the severity finding.

Functional Impact on Work and Daily Activities

How to describe it: Be specific about what you can no longer do or do only with significant difficulty because of this nerve condition. Include job duties, household tasks, personal care, recreation, and social activities. For example: 'I was a carpenter and can no longer lift materials overhead, use a nail gun, or turn my head safely when operating equipment. I have been placed on light duty and may lose my job.'

Example: On my worst days, I cannot dress myself without help because I cannot raise my right arm to put on a shirt. I cannot drive. I cannot prepare meals that require lifting pots. I cannot sleep comfortably in any position. I spend most of the day managing pain rather than functioning productively.

Examiner listens for: The specific link between CN XI motor loss and functional impairment, whether impairment affects both work and personal life, the consistency and chronicity of impairment, and whether any accommodations or assistive devices are required.

Avoid: Do not say 'I manage okay' if you have had to significantly modify your life, reduce work hours, switch jobs, or rely on others for assistance. Accurately describe the impact without minimizing.

Muscle Atrophy and Visible Deformity

How to describe it: If there is visible wasting of the trapezius or SCM muscle, or a noticeable shoulder drop or asymmetry, describe this clearly. For example: 'You can visibly see that my right trapezius muscle is much smaller than the left. My right shoulder sits lower and the shoulder blade sticks out noticeably, especially when I raise my arm.'

Example: The muscle wasting on my right side is visible in photographs. My right shoulder sits at least an inch lower than my left. My shoulder blade protrudes when I try to lift my arm, which limits how high I can raise it and causes additional pain and embarrassment.

Examiner listens for: Objective visual and palpatory evidence of denervation atrophy, scapular winging, and shoulder drop, all of which are objective markers supporting higher severity ratings.

Avoid: Do not wear bulky clothing that hides shoulder asymmetry. Wear form-fitting clothing from the waist up so the examiner can observe scapular position, muscle bulk, and shoulder height bilaterally.