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Accessory nerve disorder. Other names. Spinal accessory nerve palsy. Muscles innervated by the accessory nerve. Specialty. Neurology. Accessory nerve disorder is an injury to the spinal accessory nerve which results in diminished or absent function of the sternocleidomastoid muscle and upper portion of the trapezius muscle .
Injury to the accessory nerve can result in neck pain and weakness of the trapezius muscle. Symptoms will depend on at what point along its length the nerve was severed. [5] Injury to the nerve can result in shoulder girdle depression, atrophy, abnormal movement, a protruding scapula, and weakened abduction. [5]
Winged scapula. The left side of the thorax. (Winging not illustrated but serratus anterior is labeled at left, and trapezius is labeled at upper right.) A winged scapula ( scapula alata) is a skeletal medical condition in which the shoulder blade protrudes from a person's back in an abnormal position. In rare conditions it has the potential to ...
The trapezius muscle ( pl.: trapezii) is a surface muscle of back, shown in red above and below. Details. Origin. Medial one-third of superior nuchal line, external occipital protuberance, spinous processes of vertebrae C7-T12, Nuchal ligament [ 1] Insertion. Posterior border of the lateral one-third of the clavicle, acromion process, and spine ...
Damage to the accessory nerve (XI) will lead to weakness in the trapezius muscle on the same side as the damage. The trapezius lifts the shoulder when shrugging , so the affected shoulder will not be able to shrug and the shoulder blade ( scapula ) will protrude into a winged position. [ 3 ]
Torticollis is a fixed or dynamic tilt, rotation, with flexion or extension of the head and/or neck. The type of torticollis can be described depending on the positions of the head and neck. [ 1][ 3][ 4] A combination of these movements may often be observed. Torticollis can be a disorder in itself as well as a symptom in other conditions.
Shoulder impingement syndrome. Shoulder impingement syndrome is a syndrome involving tendonitis ( inflammation of tendons) of the rotator cuff muscles as they pass through the subacromial space, the passage beneath the acromion. It is particularly associated with tendonitis of the supraspinatus muscle. [ 1] This can result in pain, weakness ...
Damage results in an inability to shrug the shoulders or raise the arm above the head, particularly due to compromised trapezius muscle innervation. The external jugular vein's superficial location within the posterior triangle also makes it vulnerable to injury.