Question
Which of the following is true for this joint which is shown in the figure(green in color)
A. Composed of only 2 joints
B. Anterior posterior gliding of s capula of never occurs
C. Acromio clavicular joint is more important
D. Allows flexion, rotation and abduction
Show Answer
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Correct Answer » D
Explanation
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Joint is shoulder joint
D i.e. Allows flexion, rotation & abduction
• The three joints in shoulder complex are sternoclavicular, acromioclavicular, and gleno- humeral joints.
• The glenohumeral joint is a synovial ball and socket articulation between the head of the humerus and glenoid cavity of scapula. It is the most important joint of shoulder complex. Movements at this joint includes flexion, extension, abduction, adduction, medial rotation, lateral rotation and circumduction.
• Sternoclavicular & acromioclavicular joints allow movements in antero posterior and vertical planes to gether with some axial rotation.
• For every 3° abduction of arm, a 2° abduction occurs in the shoulder joint, and 1° occurs by rotation of scapula. At about 120°of abduction, the greater tuberosity of humerus hits the lateral edge of the acromian. Movements of scapula include rotation and anteroposterior gliding
