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THE SHOULDER JOINT
Chapter 5
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Bones
• Humerus• Scapula• Clavicle
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Humerus – Anterior View
1. Head2. Lesser tubercle9. Intertubercular
Groove10. Greater tubercle
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1. Head5. Deltoid
tuberoscity
Humerus – Posterior View
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DeltoidTuberoscity
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Scapula – Posterior View1. Acromion process2. Spine3. Superior angle4. Inferior angle5. Medial
(Vertebral) border
6. Lateral (Auxiliary) border
7. Supraspinous fossa
8. Infraspinous fossa
1.
2.
3.
4.
5.6.
7.
8.
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Scapula – Anterior View
1. Acromion process2. Coracoid process3. Glenoid fossa or
cavity4. Inferior angle 5. Superior angle6. Medial (Vertebral)
border7. Lateral (Auxiliary)
border8. Supscapular fossa
1. 2.
3.
4.
5.
6.7.
8.
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Scapula – Proximal (Top) View
1. Acromion process2. Coracoid process3. Glenoid fossa or
cavity4. Spine5. Supraspinous fossa
1.
2.
3.
4.
5.
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Scapula – Lateral View
1. Acromion process2. Coracoid process3. Glenoid fossa or
cavity4. Superior angle5. Inferior angle
1.
2.
3.
4.
5.
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Can You Name Them?
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Joints• There are two joints to
the shoulder complex• The acromioclavicular
(AC) joint where the clavicle meets the acromion.
• The glenohumeral joint or the shoulder joint.
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Shoulder Joint
• Ball and socket joint– Movement in all three
planes
• Glenoid fossa
• Glenoid labrum
• Head of humerus
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Joint Capsule
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Joint Capsule
• Four ligaments are the main source of stability for the shoulder, and help to keep the shoulder from dislocating.
1. Superior glenohumeral ligament
2. Coracohumeral3. Middle glenohumeral
ligament4. Inferior glenohumeral
ligament
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Other Ligaments
• The coracoacromial ligament connects the coracoid process and the acromion process
Coracoacromial ligament
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coracoacromial
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Bursa
• A bursa is a saclike structure containing lubricating fluid and located between a tendon and a bone or between moving structures.
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Shoulder (Glenohumeral) joint1. Abduction2. Adduction3. Flexion4. Extension5. Horizontal adduction6. Horizontal abduction7. External (lateral) rotation8. Internal (medial) rotation
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Actions: Sagittal plane
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Actions: Frontal plane
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Actions: Transverse plane
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Actions: Transverse plane
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Abduction/Adduction Flexion/Extension
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Internal Rotation/External Rotation
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Horizontal Adduction
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Horizontal Abduction
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Shoulder Actions and MusclesACTION• Flexion • Extension• Adduction• Abduction• Horizontal Adduction• Horizontal Abduction• Internal Rotation• External Rotation
MUSLCE LOCATION
• Anterior• Posterior• Inferior• Superior• Medial• Lateral• Medial• Lateral