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An example of trapezius function is an overhead press. When activating together, the upper and lower fibers also assist the middle fibers (along with other muscles such as the rhomboids) with scapular retraction/adduction. The trapezius also assists in abduction of the shoulder above 90 degrees by rotating the glenoid upward.
There are several options of treatment when iatrogenic (i.e., caused by the surgeon) spinal accessory nerve damage is noted during surgery. For example, during a functional neck dissection that injures the spinal accessory nerve, injury prompts the surgeon to cautiously preserve branches of C2, C3, and C4 spinal nerves that provide supplemental innervation to the trapezius muscle. [3]
Scapulothoracic exercises focus on movements of the scapula relative to the thoracic ribcage. Muscle groups such as serratus anterior, trapezius, and rhomboid major/minor need to be strengthened to allow for shoulder function. By stabilizing these muscles there is more alignment which causes a reduction in strain and protects the joints.
The two muscles most commonly inhibited during this first part of an overhead motion are the serratus anterior and the lower trapezius. [10] These two muscles act as a force couple within the glenohumeral joint to properly elevate the acromion process, and if a muscle imbalance exists, shoulder impingement may develop.
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]
Secondary to serratus anterior palsy, a winged scapula is also caused by trapezius and rhomboid muscle palsy involving the accessory nerve and the dorsal scapular nerve, respectively. [ 1 ] Though the most common causes of a winged scapula is due to serratus anterior palsy, and less commonly trapezius and rhomboid palsy, there are still other ...
Additionally, stretching the chest muscles and strengthening the back muscles can also help improve posture. [47] Exercises that strengthen the back muscles include rows, pull-ups, and shoulder blade squeezes. Exercises like doorway stretches for the chest can help stretch out tension that contributes to rounded shoulders.
the trapezius squeeze - which involves gripping and twisting a portion of the trapezius muscle in the patient's shoulder [1] mandibular pressure - this is the manual stimulation of the mandibular nerve, located within the angle of the jaw