http://www.theshouldercenter.com/suprascapular-nerve.htm
One of the most common nerves involved in shoulder pain and dysfunction is the suprascapular nerve. The suprascapular nerve takes its origin from the C5, C6, and sometimes the C4 levels at the superior trunk and supplies sensation to the shoulder joint and surrounding tissues as well as power to the supraspinatus and infraspinatus portions of the rotator cuff. Because of its location and route the suprascapular nerve is particularly susceptible to injury. For instance, it can be injured following a clavicle fracture (collarbone). Because it makes a sharp turn at the suprascapular notch, it can also be injured from acute trauma that suddenly pulls down or up on the shoulder girdle such as fall from a height, contact sports, motor vehicle accident, etc. There is also considerable variability in the size and shape of the suprascapular notch and this may also predispose some patients to suprascapular nerve injury.
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