Supraspinatus
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Origin Medial 2/3 of the supraspinatus fossa.
Insertion Superior aspect of the greater tubercle of the humerus.
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Action
Abducts the humerus holding the head of the humerus into the glenoid fossa. The supraspinatus functions during the swinging of the arm in normal walking. It is inhibitated at the and of the extremes of the arm swing.
Test position of body part Keep the arm in the anatomical position with the elbow in full extension. Abduct the arm 25 degrees.
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Stabilization
Place the hand over the acromioclavicular joint. This allows you to feel any aberrant motion in the shoulder during the muscle test.
Testing hand position Grasp the forearm above the wrist with a broad contact.
Vector of force Apply pressure at a tangent to the arc created by the natural swing of the arm in abduction. The direction will be slightly from anterior to posterior.
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