1. MUSCULOSKELETAL SYSTEM - I
Shoulder Girdle Complex

2. Shoulder Complex
• The shoulder complex are made up of 4 joints
:
 Glenohumeral joint
 Acromioclavicular (AC) joint
 Sternoclavicular (SC) joint
 Scapulothoracic joint

3. BONES
• The bones that are involve in the formation of
the shoulder joint are :
 Humerus
 Scapula
 Clavicle
 Ribs
 Sternum

4. MUSCLES
• The muscles that were involved in the
functional part of the shoulder joint are :
Pectoralis
Deltoid
Trapezius
Serratus
Rhomboids

6. SHOULDER JOINT or GLENOHUMERAL
JOINT
Multiaxial ball-and-socket joint.
The most moveable joint in the body.
Articulation of the Glenoid fossa of the
Scapula and the head of the Humerus.

7. LIGAMENTS of SHOULDER JOINT
Coracohumeral ligament - attaches the coracoid process to
the anterior region of the greater tubercle of the humerus
Transverse humeral ligament – covers the
intertubercular groove.
Glenoid labrum – fibrocartilaginous ring that add depth to the
Glenoid fossa.

8. BURSAE of SHOULDER JOINT
Subdeltoid bursa - (between the joint capsule and
deltoid muscle)
Subcoracoid bursa - (between joint capsule and coracoid
process)
Subacromial bursa - (between joint capsule and acromion of
scapula)
Subscapular bursa - (between joint capsule and tendon
of subscapularis muscle, also known as subtendinous bursa of
subscapularis muscle)

9. • Made of the synovial membrane of the joint
capsule.

10. ACROMIOCLAVICULAR (AC) JOINT
Joint at the top of the shoulder.
Junction between the acromion (part of
the scapula that forms the highest point of the shoulder)
and the clavicle.

11. STERNOCLAVICULAR (SC) JOINT
Articulation of the clavicle and the manubrium
of the sternum.

12. SCAPULOTHORACIC JOINT

13. BLOOD SUPPLY to SHOULDER JOINT
• Suprascapular vessels
• Anterior & posterior circumflex humeral
vessels
• Brachial artery
• Axillary artery
• Subscapular vessels

14. NERVE SUPPLY to SHOULDER JOINT
• Axillary nerve
• Sub scapular nerve
• Musculocutaneous nerve

16. MOVEMENTS of SHOULDER JOINT
Movements Main Muscles
Flexion Pectoralis major , Anterior deltoid
Extension Posterior deltoid , Latissimus dorsi
Adduction Pectoralis major , Latissimus dorsi , Short
head of biceps , Long head of triceps
Abduction Deltoid , Supraspinatus , Serratus anterior ,
Trapezius
Medial Rotation Pectoralis major , Anterior deltoid ,
Latissimus dorsi , Teres major
Lateral Rotation Posterior deltoid , Infraspinatus , Teres
minor