Muscles of the Thorax and Shoulder that Move the Arm Actions

Pectoralis Minor

1. Depresses scapula

2. Protracts scapula

3. Abducts scapula

4. Inferiorly rotates scapula (moves glenoid cavity downwards)

Serratus Anterior

1. Abducts scapula

2. Superiorly rotates scapula (moves glenoid cavity upwards)

Superior Fibers of Trapezius

1. Elevate scapula (and clavicle)

2. Extend head

3. Superiorly rotate scapula

Middle Fibers of Trapezius

1. Adduct scapula

Inferior fibers of Trapezius

1. Depress Scapula

Levator scapulae

1. Elevates scapula

2. Inferiorly rotates scapula

Rhomboid Minor

more superior muscle compared to counterpart

1. Elevates scapula

2. Adducts scapula

3. Inferiorly rotates scapula

Rhomboid Major

more inferior muscle compared to counterpart

1. Elevates scapula

2. Adducts scapula

3. Inferiorly rotates scapula

Pectoralis major

1. Flexes arm

2. Adducts arm

3. Medially rotates arm

fan shaped

Latissimus dorsi

1. Extends arm

2. Adducts arm

3. Medially rotates arm

triangular

Anterior fibers of Deltoid

1. Flexes arm

2. Medially rotates arm

Middle fibers of Deltoid

1. Abducts arm

Posterior fibers of Deltoid

1. Extends arm

2. Laterally rotates arm

Supraspinatus

1. Abducts arm

Infraspinatus

1. Adducts arm

2. Laterally rotates arm

Teres minor

1. Extends arm

2. Laterally rotates arm

Teres major

1. Extends arm

2. Adducts arm

3. Medially rotates arm

Subscapularis

Medially rotates arm