Human Chest and Arm Muscles

Pectoralis Major

Pectoralis Minor

Rotator Cuff Muscles

• Supraspinatus• Infraspinatus• Teres minor• Subscapularis

Another shoulder muscle, but not part of the Rotator Cuff:

• Teres Major

ROTATOR CUFF:

SubscapularisTeres minor

Supraspinatous Infraspinatous

Subscapularis

(Teres major)

(Biceps brachii)

Teres minor

Infraspinatous

Supraspinatous

ROTATOR CUFF:

SubscapularisTeres minor

Supraspinatous Infraspinatous

Rotator Cuff Injury Symptoms

• Pain and tenderness in your shoulder, especially when reaching overhead, reaching behind your back, lifting, pulling or sleeping on the affected side.

• Diagnosis– X-rays– MRI– Ultrasound

Causes of Rotator Cuff Injuries • Normal wear and tear. • Poor posture. When you slouch your neck and shoulders forward, the

space where the rotator cuff muscles reside can become smaller. This can allow a muscle or tendon to become pinched under your shoulder bones (including your collarbone), especially during overhead activities, such as throwing.

• Falling. Using your arm to break a fall or falling on your arm• Lifting or pulling. Lifting an object overhead Likewise, pulling

something, such as a high-poundage archery bow, may cause an injury.

• Repetitive overhead movement. This occurs often in athletes, especially baseball pitchers, swimmers and tennis players. It's also common among people in the building trades, such as painters and carpenters.

Deltoid

Deltoid

Biceps brachii

Deltoid

Coracobrachialis

Triceps brachii

Biceps brachii

Deltoid

Coracobrachialis

Biceps brachii

Brachialis (deep to biceps brachii)

Deltoid

Biceps brachii

Triceps brachii

Brachioradialis

Pronator teres

Extensor digitorum

Extensor carpi radialisExtensor carpi ulnaris

Ext digitorum Extensor carpi ulnaris

Ext carpi radialis

Palmaris longus

Flexor retinaculum

Flexor carpi radialis

Flexor carpi ulnaris

Palmaris longus Flexor carpi radialis

Flexor carpi ulnaris

Ext pollicis longus Ext pollicis brevis Abd pollicis longus Brachioradialis

Pronator teres

Extensor pollicis longus

Extensor pollicis brevis

Abductor pollicis longus