Shoulder Anatomy
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Transcript of Shoulder Anatomy
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Shoulder AnatomyShoulder Anatomy
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Shoulder Anatomy - bonesShoulder Anatomy - bones
• Scapula• Clavicle• Humerus
• greater tubercle
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ScapulaScapula
Subscapularfossa
Infraspinous fossa
Inferior angle
Axillaryborder
Supraspinousfossa
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Humerus
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Shoulder AnatomyShoulder Anatomy
Joints of the shoulder
• Sternoclavicular (SC) Joint
• Acromioclavicular (AC) Joint
• Glenohumeral (GH) Joint
• Scapulothoracic Articulation
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Sternoclavicular (SC) JointSternoclavicular (SC) Joint
• Synovial Joint - double gliding joint
• side to side & front to back
• Ligaments• Anterior SC• Posterior SC• Interclavicular• Costoclavicular
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SC MovementsSC Movements
• moves in many directions (but only in small amounts)• Protraction• Retraction• Elevation• Depression
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SC Joint FunctionSC Joint Function
• Absorbs forces• Distributes forces• Allows movement of
clavicle
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Shoulder Anatomy - jointsShoulder Anatomy - joints
• AcromioclavicularInjury –“Separated Shoulder”
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Acromioclavicular joint (AC)Acromioclavicular joint (AC)Support a. Capsule - dense but
weak b. Acromioclavicular
ligaments• Superior and
inferior c. Coracoclavicular
ligaments• Trapezoid-
Lateral• Conoid -Medial
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AC JointAC Joint
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Acromioclavicular JointAcromioclavicular Joint
• 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
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Coracoclavicular LigamentCoracoclavicular Ligament
• Two Parts• Conoid ligament (medial)
• Trapezoid (lateral)
• A-C Separation 1-Stretch A-C2-Complete tear of A-C; partial
tear of C-C
3-Complete tear of A-C; complete
tear of C-C
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Shoulder Anatomy - jointsShoulder Anatomy - joints
• Scapulothoracic• muscular
attachments only• The scapula meets
the rib cage!
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Scapulothoracic ArticulationScapulothoracic Articulation
• Movements:• Protraction• Retraction• Elevation• Depression• Upward Rotation• Downward Rotation
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Shoulder Anatomy - jointsShoulder Anatomy - joints
• Glenohumeral• ball and socket
• lacks bony stability (small glenoid, large humerus)
• provides motion• glenoid labrum (fibrocartilage)• rotator cuff (muscular stability)
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ROTATOR CUFFROTATOR CUFF
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Glenohumeral (GH) JointGlenohumeral (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
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Glenohumeral Glenohumeral StabilityStability
• Glenoid Cavity
(shallow)
• Glenoid labrum (soft
cartilaginous rim that
adds depth and
stability)
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GH Joint SupportGH Joint Support• Capsule • Ligaments
• Anterior – Glenohumeral
• Superior - Coracohumeral
• Coracoacromial arch• Bursae
• Subacromial• Subdeltoid• Subscapular bursa
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Coracohumeral ligament
Glenohumeral ligaments
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Glenohumeral StabilityGlenohumeral Stability• Anterior Capsule• Posterior Capsule• Glenohumeral
ligaments• Superior• Middle• Inferior
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GH MovementsGH Movements
• Sacrifices stability for mobility• Flexion• Extension• Abduction• Adduction• Internal Rotation• External Rotation
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Upper Arm & Shoulder MusclesUpper Arm & Shoulder Muscles
triceps brachiitriceps brachii
deltoiddeltoid
teres majorteres major teres minorteres minor
brachialisbrachialis
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Rotator Cuff MusclesRotator Cuff Muscles
supraspinatussupraspinatus
subscapularissubscapularisinfraspinatusinfraspinatus teres minorteres minor