Podcast
Questions and Answers
Which bone serves as the attachment for the ligaments and muscles of the shoulder girdle?
Which bone serves as the attachment for the ligaments and muscles of the shoulder girdle?
- Spine of scapula
- Acromion
- Coracoid process (correct)
- Glenoid fossa
What is the angle of inclination of the humeral head with respect to the long axis of the humeral shaft?
What is the angle of inclination of the humeral head with respect to the long axis of the humeral shaft?
- 135 degrees (correct)
- 120 degrees
- 150 degrees
- 90 degrees
Which structure allows scapular movement and shoulder mobility?
Which structure allows scapular movement and shoulder mobility?
- Glenohumeral joint (correct)
- Clavicular facets for articulation
- Acromioclavicular joint
- Saddle joint of the sternoclavicular joint
Which muscle attaches to the lesser tubercle of the humerus?
Which muscle attaches to the lesser tubercle of the humerus?
In which plane does the scapular plane movement occur?
In which plane does the scapular plane movement occur?
What structure surrounds the rim of the glenoid fossa and contributes to increased stability of the glenohumeral joint?
What structure surrounds the rim of the glenoid fossa and contributes to increased stability of the glenohumeral joint?
Which soft tissue structure acts as the 'roof' of the glenohumeral joint?
Which soft tissue structure acts as the 'roof' of the glenohumeral joint?
Which structure protects the supraspinatus muscle and tendon during arm elevation?
Which structure protects the supraspinatus muscle and tendon during arm elevation?
Which muscles are dynamic stabilizers of the glenohumeral joint?
Which muscles are dynamic stabilizers of the glenohumeral joint?
Which ligaments provide stability specific to shoulder motion and direction?
Which ligaments provide stability specific to shoulder motion and direction?
Which type of joint is the scapulothoracic joint?
Which type of joint is the scapulothoracic joint?
What is the primary function of scapulothoracic articulation?
What is the primary function of scapulothoracic articulation?
During scapulohumeral motion, what is the ratio of glenohumeral joint movement to scapulothoracic joint movement from 30 - 180 degrees?
During scapulohumeral motion, what is the ratio of glenohumeral joint movement to scapulothoracic joint movement from 30 - 180 degrees?
Which muscles assist with upward rotation of the scapula?
Which muscles assist with upward rotation of the scapula?
What is the cause of scapular 'winging'?
What is the cause of scapular 'winging'?
What are the normal motions of the scapula?
What are the normal motions of the scapula?
What is the function of the force couple in scapular movement?
What is the function of the force couple in scapular movement?
What is the purpose of scapulothoracic rhythm in the first 30 degrees of glenohumeral joint movement?
What is the purpose of scapulothoracic rhythm in the first 30 degrees of glenohumeral joint movement?
What happens in the event of scapular 'winging'?
What happens in the event of scapular 'winging'?
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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
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