THE SHOULDER JOINT

Chapter 5

Bones

• Humerus• Scapula• Clavicle

Humerus – Anterior View

1. Head2. Lesser tubercle9. Intertubercular

Groove10. Greater tubercle

1. Head5. Deltoid

tuberoscity

Humerus – Posterior View

DeltoidTuberoscity

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.

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.

Scapula – Proximal (Top) View

1. Acromion process2. Coracoid process3. Glenoid fossa or

cavity4. Spine5. Supraspinous fossa

1.

2.

3.

4.

5.

Scapula – Lateral View

1. Acromion process2. Coracoid process3. Glenoid fossa or

cavity4. Superior angle5. Inferior angle

1.

2.

3.

4.

5.

Can You Name Them?

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. Coracohumeral3. Middle glenohumeral

ligament4. 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) joint1. Abduction2. Adduction3. Flexion4. Extension5. Horizontal adduction6. Horizontal abduction7. External (lateral) rotation8. 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 MusclesACTION• Flexion • Extension• Adduction• Abduction• Horizontal Adduction• Horizontal Abduction• Internal Rotation• External Rotation

MUSLCE LOCATION

• Anterior• Posterior• Inferior• Superior• Medial• Lateral• Medial• Lateral