Shoulder Joint Study Guide

Glenohumeral Horizontal Adduction

1. Anterior Deltoid 2. Pectoralis Major 3. Coracobrachialis

Glenohumeral Flexion

1. Anterior Deltoid 2. Upper pectoralis major 3. Corocobrachialis

Know all the actions of the muscles of the shoulder joint. And daily movements or exercises that would activate these muscles (ie. A bench press = pectoralis major, a Lat Pull down, etc.). SUPERIOR/LATERAL MUSCLES

1. Anterior Deltoid Fibers -Abduction -Shoulder Extension -External Rotation -Horizontal/Diagonal Abduction 2. Posterior Deltoid Fibers -Abduction -Shoulder Flexion -Internal Rotation -Horizontal/Diagonal Adduction 3. Supraspinatus -Abduction

Glenohumeral Abduction

1. Deltoid 2. Supraspinatus

What are the intrinsic muscles of the shoulder joint? Where do they originate?

1. Deltoid, Coracobrachialis, Teres major 2. Rotator cuff group -Subscapularis, supraspinatus, infraspinatus, teres minor - Originate on scapula & clavicle

What is the functional and structural classification, type, and anatomical name of the shoulder joint?

1. FC: Diarthrodial 2. SC: Synovial 3. Type: Ball and Socket 4. Glenohumeral joint

What is the glenoid labrum? List two functions of the glenoid labrum.

1. Fibrocartilage rim lining the glenoid fossa 2. Slightly enhances stability 3. Deepens the glenoid fossa

Know the movements of the shoulder joint. And examples of each.

1. Flexion/Extension 2. Abduction/Adduction 3. External/Internal Rotation 4. Horizontal adduction/abduction 5. Diagonal abduction/adduction

Because there is such extreme range of motion available at the shoulder joint, what actually provides stability at this joint?

1. Glenohumeral ligaments 2. Muscles help stabilize the rotator cuff

What bones make up the shoulder joint?

1. Head of Humerus 2. Glenoid fossa

Glenohumeral External Rotation

1. Infraspinatus 2. Teres Minor 3. Posterior Deltoid

Know all the actions of the muscles of the shoulder joint. And daily movements or exercises that would activate these muscles (ie. A bench press = pectoralis major, a Lat Pull down, etc.). POSTERIOR MUSCLES

1. Latissimus Dorsi -Extension -Adduction -Internal Rotation -Horizontal Abduction 2. Teres Major -Extension -Adduction -Internal Rotation 3. Infraspinatus -Extension -Horizontal Abduction -External Rotation 4. Teres Minor -Extension -External Rotation -Horizontal/Diagonal Abduction

Glenohumeral Adduction

1. Latissimus Dorsi 2. Teres Major 3. Lower Pectoralis Major

Glenohumeral Internal Rotation

1. Latissimus Dorsi 2. Teres Major 3. Subscapularis 4. Pectoralis Major 5. Anterior Deltoid

List three reasons why the shoulder joint has instability problems.

1. Laxity of ligaments 2. Shallowness of glenoid fossa 3. Lack of muscular strength and endurance

Know all the actions of the muscles of the shoulder joint. And daily movements or exercises that would activate these muscles (ie. A bench press = pectoralis major, a Lat Pull down, etc.). ANTERIOR MUSCLES

1. Pectoralis Major -Shoulder flexion -Internal Rotation -Diagonal/Horizontal Adduction -Adduction 2. Coracobrachialis -Flexion -Adduction -Horizontal/Diagonal Adduction 3. Subscapularis -Extension -Adduction -Internal Rotation

Glenohumeral Diagonal Abduction

1. Posterior Deltoid 2. Infraspinatus 3. Teres Minor 4. Triceps Brachii

Glenohumeral Horizontal Abduction

1. Posterior Deltoid 2. Middle Deltoid 3. Infraspinatus 4. Teres Minor

What type of activities can injure rotator cuff muscles?

1. Repetitious overhead activities with poor technique, muscle fatigue. 2. Inadequate warm up and conditioning

What is the downfall of having such extreme range of motion at the shoulder joint?

1. Rotator cuff impingement can be triggered 2. Subluxations and dislocations may occur

Why is there so much laxity in the ligaments of the shoulder joint?

1. Stability is sacrificed to gain mobility. Ligaments- static They give us range of motion = laxity

What is the major function of all the rotator cuff muscles?

1. Stabilize shoulder joint by keeping head of the humerus in the correct position in the glenoid fossa.

What are the names of the four rotator cuff muscles? What are their actions at the shoulder joint?

1. Subscapularis 1. Extension 2. Internal Rotation 3. Adduction 2. Supraspinatus 1. Abduction 3. Infraspinatus 1. Extension 2. External Rotation 3. Horizontal abduction 4. Teres minor 1. Extension 2. External Rotation 3. Horizontal/ Diagonal Abduction

Glenohumeral Extension

1. Teres Major 2. Latissimus Dorsi 3. Infraspinatus

3. Know examples of concentric and eccentric movements at the shoulder joint. Don't forget that when you are working with a weight stack it changes things! Then you look at how the weight stack is moving (not your body) in relation to gravity!

Eccentric of shoulder= 2 pound weight lowering it down