10 Questions
Which joint within the shoulder complex is a false joint?
Scapulothoracic articulation
Which joint within the shoulder complex is associated with the movement of the scapula on the thorax?
Sternoclavicular joint
What is the ultimate function of scapular motion within the shoulder complex?
To orient the glenoid for optimal contact with the humeral head
Which part of the scapula is located about 6 cm lateral to the spine within the shoulder complex?
Lateral border
Which joint within the shoulder complex is responsible for the movement of the scapula on the thorax?
Scapulothoracic articulation
What is the range of upward rotation of the scapula within the shoulder complex?
30 to 40 degrees
What is the range of internal rotation of the scapula within the shoulder complex?
30-40 degrees
What is the function of scapular motion within the shoulder complex?
All of the above
Which part of the scapula is located about 6 cm lateral to the spine within the shoulder complex?
Medial border
Which joint within the shoulder complex is a true joint?
Glenohumeral joint
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.
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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