CH 22.Shoulder I - scapula and distal end of clavicle •...

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CH 22: The Shoulder Part I: Anatomy
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Shoulder Complex Bony Anatomy Clavicle “strut” Provides protection, contour, attachment site, S-shape Scapula Flat, triangular Landmarks p. 641
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Acromion types Flat Curved Hooked
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Bony complex con’t Sternum Manubrium Body Xiphoid process
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Proximal Humerus Humerus (p. 641) Head Greater tuberosity Lesser tuberosity Bicipital (intertubercular) groove
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Glenohumeral Joint (“Shoulder”) Head of humerus and glenoid fossa of scapula Ball and socket joint Unstable bony structure
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Scapulothoracic Articulation
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Scapulohumeral Rhythm 2:1 relationship http://www.youtube.com/watch?v=Z1Ykc0Xv1Fs
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Scapular Motions
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Sternoclavicular Joint Only bony attachment between upper limbs and axial skeleton
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Acromioclavicular Joint Between acromion process of the
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Unformatted text preview: scapula and distal end of clavicle • “Separated shoulder” These articulations act together in a way that produces mobility greater than that afforded by any one individual articulation Bursa and Labrum Bursa Subacromial between acromion and capsule Labrum Fibrocartilage Provides 50% of depth of GH jt Increased stability Joint Capsule Joint capsule Stabilizing role Folds and unfolds Envelopes the biceps long head Rotator Cuff stabilizer of GH joint supraspinatus in particular depresses head against fossa for stabilization “SITS” group Rotator Cuff: Supraspinatus Posterior View Rotator Cuff: Infraspinatus Posterior View Rotator Cuff: Teres Minor Posterior View Rotator Cuff: Subscapularis Posterior View...
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