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The Shoulder

The Shoulder. Anatomy. Bones. 4 Articulations – AC, GH, SC, and Sub Ac Glenoid Labrum – fibrocartilagenous rim of glenoid fossa 50% of socket provided by Labrum. Capsule. Glenoid margin to humeral anatomical neck Lax Lined with synovial membrane Becomes weaker with age

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The Shoulder

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  1. The Shoulder Anatomy

  2. Bones • 4 Articulations – AC, GH, SC, and Sub Ac • Glenoid Labrum – fibrocartilagenous rim of glenoid fossa • 50% of socket provided by Labrum

  3. Capsule • Glenoid margin to humeral anatomical neck • Lax • Lined with synovial membrane • Becomes weaker with age • Coracohumeral ligament – broad thickening of upper capsule

  4. Ligaments • Superior, middle and inferior Glenohumeral Ligaments • Coracoacromial - forms the coracoacromial arch • Transverse humeral

  5. Anterior Scapula Muscle Attachments

  6. Posterior Scapula Muscle Attachments

  7. Anterior Musculature • Supraspinatus • Subscapularis • Biceps • Coracobrachialis • Pectoralis Major and Minor • Deltoid

  8. Posterior Musculature • Infraspinatus • Teres Minor • Triceps

  9. Rotator Cuff • Reduces AP shearing • Subscapularis most powerful • Inferior rotator cuff controls centring of the humeral head in elevation Infraspin. Subscap. Teres minor

  10. Bursa • Main pain generators of shoulder? • Subscapula bursa – communicates with capsule • Subacromial bursa – facilitates movt between coracoacromial arch + subjacent supraspinatus + shoulder joint

  11. Neurology • Supplied by C5 • C4 AC joint Dermatomes • C4 top of shoulder • C5 lat asp of arm to wrist Muscles • C5 Deltoid, supraspinatus, infraspinatus • C6 Biceps, Subscapularis • C7 Triceps, Lat Dorsi, Pec Major, Teres Major

  12. Surface Markings • Supraspinatus insertion • Subscapularis insertion • Infraspinatus insertion • Acromion • Coracoid • AC joint line – sagital plane

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