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Shoulder Anatomy

Shoulder Anatomy. Shoulder Anatomy - bones. Scapula Clavicle Humerus greater tubercle. Scapula. Supraspinous fossa. Infraspinous fossa. Subscapular fossa. Axillary border. Inferior angle. Humerus. Joints of the shoulder Sternoclavicular (SC) Joint Acromioclavicular (AC) Joint

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Shoulder Anatomy

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  1. Shoulder Anatomy

  2. Shoulder Anatomy - bones • Scapula • Clavicle • Humerus • greater tubercle

  3. Scapula Supraspinous fossa Infraspinous fossa Subscapular fossa Axillary border Inferior angle

  4. Humerus

  5. Joints of the shoulder Sternoclavicular (SC) Joint Acromioclavicular (AC) Joint Glenohumeral (GH) Joint Scapulothoracic Articulation Shoulder Anatomy

  6. Sternoclavicular (SC) Joint • Synovial Joint - double gliding joint • side to side & front to back • Ligaments • Anterior SC • Posterior SC • Interclavicular • Costoclavicular

  7. SC Movements • moves in many directions (but only in small amounts) • Protraction • Retraction • Elevation • Depression

  8. SC Joint Function • Absorbs forces • Distributes forces • Allows movement of clavicle

  9. Shoulder Anatomy - joints • Acromioclavicular Injury – “Separated Shoulder”

  10. Acromioclavicular joint (AC) Support a. Capsule - dense but weak b. Acromioclavicular ligaments • Superior and inferior c. Coracoclavicular ligaments • Trapezoid- Lateral • Conoid -Medial

  11. AC Joint

  12. A-C Ligament: strengthens A-C joint along with fibers from trapezius Coracoclavicular Ligament: anchors Clavicle to coracoid process; strongest ligament binding the clavicle to scapula Acromioclavicular Joint

  13. Two Parts Conoid ligament (medial) Trapezoid (lateral) A-C Separation 1-Stretch A-C 2-Complete tear of A-C; partial tear of C-C 3-Complete tear of A-C; complete tear of C-C Coracoclavicular Ligament

  14. Shoulder Anatomy - joints • Scapulothoracic • muscular attachments only • The scapula meets the rib cage!

  15. Scapulothoracic Articulation • Movements: • Protraction • Retraction • Elevation • Depression • Upward Rotation • Downward Rotation

  16. Shoulder Anatomy - joints • Glenohumeral • ball and socket • lacks bony stability (small glenoid, large humerus) • provides motion • glenoid labrum (fibrocartilage) • rotator cuff (muscular stability)

  17. ROTATOR CUFF

  18. Glenohumeral (GH) Joint • “True Shoulder Joint” • Synovial Joint - Ball and Socket • Glenoid fossa & labrum with Humeral Head • 3 Major Ligaments: • Coracohumeral - coracoid to greater tubercle (strong) • 3 GH bands - thickenings of articular capsule • Transverse Humeral - greater to lesser tubercle

  19. Glenoid Cavity (shallow) Glenoid labrum (soft cartilaginous rim that adds depth and stability) Glenohumeral Stability

  20. GH Joint Support • Capsule • Ligaments • Anterior – Glenohumeral • Superior - Coracohumeral • Coracoacromial arch • Bursae • Subacromial • Subdeltoid • Subscapular bursa

  21. Coracohumeral ligament Glenohumeral ligaments

  22. Anterior Capsule Posterior Capsule Glenohumeral ligaments Superior Middle Inferior Glenohumeral Stability

  23. GH Movements • Sacrifices stability for mobility • Flexion • Extension • Abduction • Adduction • Internal Rotation • External Rotation

  24. Upper Arm & Shoulder Muscles deltoid brachialis triceps brachii teres major teres minor

  25. supraspinatus Rotator Cuff Muscles infraspinatus teres minor subscapularis

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