THE SHOULDER JOINTChapter 5

• Scapula

• Humerus

Bones

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

1.

2.

3.

4.

5.6.

7.

8.

Scapula – Posterior View

1. Acromion process

2. Coracoid process

3. Glenoid fossa or cavity

4. Inferior angle

5. Superior angle

6. Medial (Vertebral) border

7. Lateral (Auxiliary) border

8. Supscapular fossa

1. 2.

3.

4.

5.

6.7.

8.

Scapula – Anterior View

1. Acromion process

2. Coracoid process

3. Glenoid fossa or cavity

4. Spine

5. Supraspinous fossa

1.

2.

3.

4.

5.

Scapula – Proximal View

1. Acromion process

2. Coracoid process

3. Glenoid fossa or cavity

4. Superior angle

5. Inferior angle

1.

2.

3.

4.

5.

Scapula – Lateral View

1. Head

2. Lesser tubercle

9. Intertubercular Groove

10. Greater tubercle

Humerus – Anterior View

1. Head5. Deltoid tuberoscity

Humerus – Posterior View

DeltoidTuberoscity

• 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.

Joints

• Ball and socket joint

• Movement in all three planes

• Glenoid fossa

• Glenoid labrum

• Head of humerus

Shoulder Joint

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

Joint Capsule

• The coracoacromial ligament connects the coracoid process and the acromion process

Coracoacromial ligament

Other Ligaments

coracoacromial

• A bursa is a saclike structure containing lubricating fluid and located between a tendon and a bone or between moving structures.

Bursa

1. Abduction

2. Adduction

3. Flexion

4. Extension

5. Horizontal adduction

6. Horizontal abduction

7. External (lateral) rotation

8. Internal (medial) rotation

Shoulder (Glenohumeral) joint

Actions: Sagittal plane

Actions: Frontal plane

Actions: Transverse plane

Actions: Transverse plane

Abduction/Adduction Flexion/Extension

Internal Rotation/External Rotation

Horizontal Adduction

Horizontal Abduction

ACTION

• Flexion

• Extension

• Adduction

• Abduction

• Horizontal Adduction

• Horizontal Abduction

• Internal Rotation

• External Rotation

MUSLCE LOCATION

• Anterior

• Posterior

• Inferior

• Superior

• Medial

• Lateral

• Medial

• Lateral

Shoulder Actions and Muscles

Humerus & Scapula

FlexionAbduction &

ElevationUpward rotation

Extension

Adduction & DepressionDownward

rotation

Humerus & Scapula

AbductionUpward rotation

& Elevation

AdductionDownward

rotation& Depression

Humerus & Scapula

Internal RotationAbduction

External Rotation Adduction