Shoulder Complex Biomechanics Quiz
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Questions and Answers

Which joint within the shoulder complex is a false joint?

  • Scapulothoracic articulation (correct)
  • Sternoclavicular joint
  • Acromioclavicular joint
  • Glenohumeral joint
  • Which joint within the shoulder complex is associated with the movement of the scapula on the thorax?

  • Sternoclavicular joint (correct)
  • Glenohumeral joint
  • Scapulothoracic articulation
  • Acromioclavicular joint
  • What is the ultimate function of scapular motion within the shoulder complex?

  • To rotate the humerus
  • To provide stability to the shoulder joint
  • To connect the clavicle and scapula
  • To orient the glenoid for optimal contact with the humeral head (correct)
  • Which part of the scapula is located about 6 cm lateral to the spine within the shoulder complex?

    <p>Lateral border</p> Signup and view all the answers

    Which joint within the shoulder complex is responsible for the movement of the scapula on the thorax?

    <p>Scapulothoracic articulation</p> Signup and view all the answers

    What is the range of upward rotation of the scapula within the shoulder complex?

    <p>30 to 40 degrees</p> Signup and view all the answers

    What is the range of internal rotation of the scapula within the shoulder complex?

    <p>30-40 degrees</p> Signup and view all the answers

    What is the function of scapular motion within the shoulder complex?

    <p>All of the above</p> Signup and view all the answers

    Which part of the scapula is located about 6 cm lateral to the spine within the shoulder complex?

    <p>Medial border</p> Signup and view all the answers

    Which joint within the shoulder complex is a true joint?

    <p>Glenohumeral joint</p> Signup and view all the answers

    Study Notes

    Shoulder Complex Joints

    • The false joint within the shoulder complex is the scapulothoracic joint. It is not a true anatomical joint as it lacks a synovial capsule.
    • The joint responsible for the movement of the scapula on the thorax is the scapulothoracic joint. This allows for gliding movements between the scapula and the thoracic wall.
    • The true joint in the shoulder complex is the glenohumeral joint, which connects the humerus to the scapula.

    Scapular Motion

    • The ultimate function of scapular motion is to enhance the range of motion of the arm, provide stability to the shoulder, and support muscle function.
    • The range of upward rotation of the scapula is approximately 60 degrees. This rotation is essential for raising the arms overhead.
    • The range of internal rotation of the scapula is about 20 to 25 degrees, which helps in maneuvering the shoulder girdle during various movements.

    Anatomical Location

    • The part of the scapula located about 6 cm lateral to the spine is the medial (vertebral) border of the scapula. This reference point is crucial for anatomical positioning and understanding scapular mechanics.

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    Description

    Test your knowledge of shoulder complex biomechanics with this quiz by Dr. Safy Eldin AboAli. Learn about the shoulder girdle, scapula, clavicle, and the various joints within the shoulder complex, including the true and functional joints. Challenge yourself to understand the movement and articulation of the scapula on the thorax.

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