19 Questions
Which bone serves as the attachment for the ligaments and muscles of the shoulder girdle?
Coracoid process
What is the angle of inclination of the humeral head with respect to the long axis of the humeral shaft?
135 degrees
Which structure allows scapular movement and shoulder mobility?
Glenohumeral joint
Which muscle attaches to the lesser tubercle of the humerus?
Subscapularis
In which plane does the scapular plane movement occur?
Sagittal plane
What structure surrounds the rim of the glenoid fossa and contributes to increased stability of the glenohumeral joint?
Glenoid labrum
Which soft tissue structure acts as the 'roof' of the glenohumeral joint?
Coracoacromial ligament
Which structure protects the supraspinatus muscle and tendon during arm elevation?
Subacromial bursa
Which muscles are dynamic stabilizers of the glenohumeral joint?
Rotator cuff muscles and the long head of the biceps brachii
Which ligaments provide stability specific to shoulder motion and direction?
Glenohumeral ligaments
Which type of joint is the scapulothoracic joint?
Not a true joint, but dynamic musculature forces stabilize it
What is the primary function of scapulothoracic articulation?
Increase range of motion for greater reach
During scapulohumeral motion, what is the ratio of glenohumeral joint movement to scapulothoracic joint movement from 30 - 180 degrees?
2:1
Which muscles assist with upward rotation of the scapula?
Upper trapezius and lower trapezius
What is the cause of scapular 'winging'?
Serratus anterior fails to protract during reaching or forward motion
What are the normal motions of the scapula?
Elevation, depression, protraction, retraction
What is the function of the force couple in scapular movement?
To produce upward and downward scapular rotation
What is the purpose of scapulothoracic rhythm in the first 30 degrees of glenohumeral joint movement?
To distribute movement between the glenohumeral and scapulothoracic joints
What happens in the event of scapular 'winging'?
The medial border of the scapula comes off the thoracic cage
Study Notes
The Glenohumeral Joint: Key Facts and Anatomy
- The glenohumeral joint is the shoulder joint, designed for mobility but lacks stability
- Stability is compromised by increased mobility and relies on soft tissue structures
- The joint is surrounded by articulate cartilage and a fibrous joint capsule with a synovial membrane
- The Glenoid labrum surrounds the rim of the glenoid fossa and helps increase stability
- The Coracoacromial Arch, formed by the coracoacromial ligament, acts as the "roof" of the joint
- Subacromial bursa protects the supraspinatus muscle and tendon during arm elevation
- The rotator cuff muscles and the long head of the biceps brachii are dynamic stabilizers
- The deltoid assists shoulder abduction while the rotator cuff muscles assist in compression
- Glenohumeral ligaments provide stability and are specific to shoulder motion and direction
- Shoulder movements occur in the sagittal, frontal, and horizontal planes around different axes
- Arthrokinematics of shoulder movements involve rolling and gliding of the humeral head
- The scapulothoracic joint is not a true joint, but dynamic musculature forces stabilize it
Test your knowledge of the glenohumeral joint with this quiz. Explore key facts and anatomy, including structures like the glenoid labrum, coracoacromial arch, and rotator cuff muscles. Gain insights into the joint's stability, movements, and arthrokinematics.
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