MUSCULOSKELETAL SYSTEM - I Shoulder Girdle Complex
Shoulder Complex• The shoulder complex are made up of 4 joints : Glenohumeral joint Acromioclavicular (AC) joint Sternoclavicular (SC) joint Scapulothoracic joint
BONES• The bones that are involve in the formation of the shoulder joint are : Humerus Scapula Clavicle Ribs Sternum
MUSCLES• The muscles that were involved in the functional part of the shoulder joint are :PectoralisDeltoidTrapeziusSerratusRhomboids
SHOULDER JOINT or GLENOHUMERAL JOINTMultiaxial 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.
LIGAMENTS of SHOULDER JOINTCoracohumeral ligament - attaches the coracoid process to the anterior region of the greater tubercle of the humerusTransverse humeral ligament – covers the intertubercular groove.Glenoid labrum – fibrocartilaginous ring that add depth to the Glenoid fossa.
BURSAE of SHOULDER JOINTSubdeltoid 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)
• Made of the synovial membrane of the joint capsule.
ACROMIOCLAVICULAR (AC) JOINTJoint 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.
STERNOCLAVICULAR (SC) JOINTArticulation of the clavicle and the manubrium of the sternum.
NERVE SUPPLY to SHOULDER JOINT• Axillary nerve• Sub scapular nerve• Musculocutaneous nerve
MOVEMENTS of SHOULDER JOINTMovements Main MusclesFlexion Pectoralis major , Anterior deltoidExtension Posterior deltoid , Latissimus dorsiAdduction Pectoralis major , Latissimus dorsi , Short head of biceps , Long head of tricepsAbduction Deltoid , Supraspinatus , Serratus anterior , TrapeziusMedial Rotation Pectoralis major , Anterior deltoid , Latissimus dorsi , Teres majorLateral Rotation Posterior deltoid , Infraspinatus , Teres minor