It is assumed that you all are familiar with the ranges of motion that occur at the glenohumeral joint. However, have you ever stopped think of the minutiae that occurs at 
1.  Instantaneous centers of rotation
2.  Specific movements of the scapulo-thoracic ‘joint’
3.  Divisions of the deltoid muscle and abduction
 with different ranges of motion? Explain for each of the three listed. 

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Due Wednesday February 5, 2020