The Shoulder - The Shoulder The Cooperative Action of the...

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The Shoulder The Cooperative Action of the Shoulder and Shoulder Girdle The shoulder and shoulder and shoulder girdle co-operate to enable a wide range of movements. o The scapula co-operates by placing the glenoid fossa in the most favorable position for the head of the humerus example - in abduction the scapula accounts for about 59 ° of movement while the humerus accounts for about 113 ° of movement - this is approximately a 2:1 ratio The upper extremity is suspended from the skeleton by the shoulder girdle The sternoclavicular joint is the only skeletal connection between the upper limb and trunk This structure accounts for extensive freedom of motion enjoyed by the arm o Range of Motion is greatly increased due to the ball and socket nature of the glenohumeral joint, and these movements are amplified by the co-operation of the shoulder girdle. The Shoulder Joint
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This is the glenohumeral articulation Pear shaped glenoid fossa The shoulder joint capsule is very loose – allowing for great ROM
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This note was uploaded on 09/25/2010 for the course EXS 31757 taught by Professor Brennan during the Spring '10 term at Oakland University.

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The Shoulder - The Shoulder The Cooperative Action of the...

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