Upper Extremity Muscle Function

Front 1

Trapezius

Back 1

Adducts/retracts, elevates and rotates scapula

Front 2

Levator scapulae

Back 2

Elevates scapula

Front 3

Rhomboideus major and minor

Back 3

Adducts/retracts and rotates scapula

Front 4

Latissimus dorsi

Back 4

Adducts, medially rotates and extends humerus

Front 5

Deltoideus

Back 5

Abducts humerus

Front 6

Teres major

Back 6

Adducts and medially rotates humerus

Front 7

Serratus anterior

Back 7

Protracts and rotates scapula

Front 8

Pectoralis major (clavicular head)

Back 8

Adducts and flexes humerus

Front 9

Pectoralis major (sternocostal head)

Back 9

Adducts and medially rotates humerus

Front 10

Pectoralis minor

Back 10

Protracts and depresses scapula

Front 11

Subclavius

Back 11

Draws clavicle down and forward

Front 12

Subscapularis

Back 12

Medially rotates humerus

Front 13

Infraspinatus

Back 13

Laterally rotates humerus

Front 14

Supraspinatus

Back 14

Abducts humerus

Front 15

Teres minor

Back 15

laterally rotates humerus

Front 16

Biceps bracchi

Back 16

Flexes arm; flexes and supinates forearm

Front 17

Coracobrachialis

Back 17

Adducts and flexes humerus

Front 18

Brachialis

Back 18

Flexes forearm

Front 19

Triceps brachii

Back 19

Extends and adducts arm; extends forearm

Front 20

Pronator teres

Back 20

Pronates forearm

Front 21

Flexor carpi radialis

Back 21

Flexes arm and wrist; radial deviation

Front 22

Palmaris longus

Back 22

flexes wrist

Front 23

Flexor carpi ulnaris

Back 23

Flexes wrist; ulnar deviation of hand

Front 24

Flexor digitorum superficialis

Back 24

Flexes forearm, wrist, MCPs, and PIPs of digits II-V

Front 25

Flexor digitorum profundus

Back 25

Flexes wrist and MCPs, PIPs, and DIPS of digits II-V

Front 26

Flexor pollicis longus

Back 26

Flexes MCP and IP of thumb

Front 27

Pronator quadratus

Back 27

Pronates forearm

Front 28

Brachioradialis

Back 28

Flexes forearm in partial pronation

Front 29

Anconeus

Back 29

Extends forearm

Front 30

Supinator

Back 30

Supinates forearm

Front 31

Extensor carpi radialis longus/brevis

Back 31

Extends wrist; radial deviation

Front 32

Extensor digitorum

Back 32

Extends wrist and digits II-V

Front 33

Extensor digiti minimi

Back 33

Extends digit V

Front 34

Extensor carpi ulnaris

Back 34

Extends wrist; ulnar deviation

Front 35

Abductor pollicis

Back 35

Abducts pollex; radial deviation

Front 36

Extensor pollicis brevis

Back 36

Extends MCP of pollex

Front 37

Extensor pollicis longus

Back 37

Extends MCP and IP of pollex

Front 38

Extensor inidicus

Back 38

Extends PIP of of digit II

Front 39

Abductor/Flexor pollicis brevis

Back 39

Abducts MCP of pollex

Front 40

Opponens pollicis

Back 40

Opposition of MCP of pollex

Front 41

Adductor pollicis

Back 41

Adducts MCP of pollex

Front 42

Palmaris brevis

Back 42

Corrugates skin at hypothenar region

Front 43

Abductor digit minimi

Back 43

Abducts MCP of digit V

Front 44

Flexor digiti minimi

Back 44

Flexes MCP of digit V

Front 45

Opponens digiti minimi

Back 45

Opposition of MCP of digit V

Front 46

Lumbricales

Back 46

Flexes MCPs, extends PIPs and DIPs of digits

Front 47

Palmar interossei

Back 47

Adducts MCPs of digits II, IV, and V

Front 48

Dorsal interossei

Back 48

Abducts MCPs of digits II-IV