10 Questions
The abductors of the genohumeral joint are:
Supraspinatous, deltoid (all fibres)
Flexors of the glenohumeral joint are:
Deltoid (anterior fibres), pectoralis major, coracobrachialis, biceps brachii
Internal rotators of the glenohumeral joint are:
Subscapularis, teres major, pectoralis major, latissimus dorsi
Adductors of the glenohumeral joint are:
Pectoralis major, latissimus dorsi, coracobrachialis, (teres major, subscapularis)
Extensors of the glenohumeral joint are:
Latissimus dorsi, deltoid (posterior fibres), triceps brachii
External rotators of the glenohumeral joint are:
Infraspinatous, teres major
Elevators of the scapula are:
trapezius (superior fibres), levator scapulae
Depressors of the scapula are:
trapezius (inferior fibres)
Protractors of the scapula are:
Pectoralis major, seratus anterior
Retraction and medial rotation of the scapula are:
Levator scapulae, rhomboid major, rhomboid minor, trapezius (middle fibres)
Study Notes
Glenohumeral Joint Abduction
Definition
- Glenohumeral joint abduction: the movement of the humerus (upper arm bone) away from the midline of the body in the frontal plane, resulting in the arm moving outward and upward.
Muscles Involved
- Primary movers:
- Deltoid muscle (anterior and middle fibers)
- Supraspinatus muscle
- Secondary movers:
- Trapezius muscle
- Serratus anterior muscle
Range of Motion
- Normal range of motion: 0-180° ( arm at side to arm fully abducted)
- Average range of motion: 150-160°
Movement Pattern
- Initial phase (0-30°): scapula rotates downward and upward, humerus abducted by supraspinatus and deltoid muscles
- Middle phase (30-90°): scapula rotates upward and outward, humerus abducted by deltoid and trapezius muscles
- Late phase (90-180°): scapula rotates upward and outward, humerus abducted by deltoid and serratus anterior muscles
Importance
- Essential for many daily activities, such as:
- Reaching for objects
- Throwing
- Lifting
- Carrying
- Abnormalities in glenohumeral joint abduction can lead to:
- Shoulder impingement
- Rotator cuff injuries
- Scapular winging
Test your knowledge of the glenohumeral joint abduction, including the muscles involved, range of motion, and movement patterns. Learn about the importance of this movement in daily activities and how abnormalities can lead to injuries.
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