Deltoid

Abducts the shoulderPosterior deltoid extends the shoulder

Anterior deltoid flexes the shoulder

Biceps Brachii

• Flexes the elbow • Supination of the forearm and shoulder

Brachioradialis

• Flexes the elbow

Origin: infraspinatus fossa of scapula

Insertion: Greater tubercle of the humerus

Action: Lateral rotation of the shoulder (humerus), horizontal adduction of the humerus (shoulder)

Infraspinatus Muscle

Supraspinatus

Origin: Supraspinatus fossa of the scapula

Insertion: The greater tubercle of the humerus

Action: Abduction of the shoulder (humerus) and stabilizes the shoulder joint

Flexor Carpi Ulnaris

Origin: medial epicondyle of humerus and olecranon process of ulna

Insertion: Base of the fifth metacarpal

Action: Flexes wrist; acts with Extensor carpi ulnaris to adduct wrist

Teres minor: lateral (external) rotation of humerus

Extensor carpi ulnaris: extends and adducts the wristFlexor carpi ulnaris: flexes wrist and abducts the wrist

Extersor carpi ulnaris Flexor carpi

ulnaris

Extersor carpi ulnaris

Flexor carpi ulnaris

Triceps brachii: extends elbow and shoulder

Trapezius

Elevates, depresses, and retracts the scapula. When they both act together, draws head dorsally (backwards).

Latissimus Dorsi

Adducts and extends the shoulder (humerus)Rotates the shoulder (humerus)Draws the shoulder down and backward.

Extensor Carpi Radialis

Extends and abducts the wrist.Acts with the flexor carpi radialis to abduct the wrist.

Subscapularis: Medial internal and lateral external rotation of the humorous bone; stabilizes shoulder

Brachialis: flexes elbow

Flexor Carpi Radialis: flexes and abducts wrist