THE SHOULDER JOINT Chapter 5 Bones Scapula Humerus
THE SHOULDER JOINT Chapter 5
Bones • Scapula • Humerus
Scapula – Posterior View 1. Acromion process 2. Spine 3. Superior angle 4. Inferior angle 5. Medial (Vertebral) border 6. Lateral (Auxiliary) border 7. Supraspinous fossa 8. Infraspinous fossa 3. 1. 7. 2. 8. 5. 6. 4.
Scapula – Anterior View 1. 2. 5. 1. Acromion process 2. Coracoid process 3. Glenoid fossa or cavity 4. Inferior angle 5. Superior angle 8. 6. 7. 6. Medial (Vertebral) border 7. Lateral (Auxiliary) border 8. Supscapular fossa 4.
Scapula – Proximal View 1. Acromion process 2. Coracoid process 4. 3. 5. 3. Glenoid fossa or cavity 4. Spine 5. Supraspinous fossa 2.
Scapula – Lateral View 4. 1. 2. 1. Acromion process 2. Coracoid process 3. Glenoid fossa or cavity 4. Superior angle 5. Inferior angle 5.
Humerus – Anterior View 1. Head 2. Lesser tubercle 9. Intertubercular Groove 10. Greater tubercle
Humerus – Posterior View 1. Head 5. Deltoid tuberoscity
Deltoid Tuberoscity
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.
Shoulder Joint • Ball and socket joint • Movement in all three planes • Glenoid fossa • Glenoid labrum • Head of humerus
Joint Capsule
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. Coracohumeral 3. Middle glenohumeral ligament 4. Inferior glenohumeral ligament
Other Ligaments • The coracoacromial ligament connects the coracoid process and the acromion process Coracoacromial ligament
coracoacromial
Bursa • A bursa is a saclike structure containing lubricating fluid and located between a tendon and a bone or between moving structures.
Shoulder (Glenohumeral) joint 1. Abduction 2. Adduction 3. Flexion 4. Extension 5. Horizontal adduction 6. Horizontal abduction 7. External (lateral) rotation 8. Internal (medial) rotation
Actions: Sagittal plane
Actions: Frontal plane
Actions: Transverse plane
Actions: Transverse plane
Abduction/Adduction Flexion/Extension
Internal Rotation/External Rotation
Horizontal Adduction
Horizontal Abduction
Shoulder Actions and Muscles ACTION MUSLCE LOCATION • Flexion • Anterior • Extension • Posterior • Adduction • Inferior • Abduction • Superior • Horizontal Adduction • Medial • Horizontal Abduction • Lateral • Internal Rotation • Medial • External Rotation • Lateral
Humerus & Scapula Flexion Extension Abduction & Elevation Upward rotation Adduction & Depression Downward rotation
Humerus & Scapula Abduction Upward rotation & Elevation Adduction Downward rotation & Depression
Humerus & Scapula Internal Rotation External Rotation Abduction Adduction
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