Muscle Actions

Question 1

Trapezius

Answer 1

Elevate, depress, retract scapula

Question 2

Levator scapulae

Answer 2

Retract, elevate scapula

Question 3

Rhomboid major

Answer 3

Retract scapula

Question 4

Rhomboid minor

Answer 4

Retract scapula

Question 5

Latissimus dorsi

Answer 5

Adduct arm, medially rotate

Question 6

Serratus anterior

Answer 6

90 degree + abduction with trapezius
Protract scapula (scapula away from spine)

Question 7

Splenius capitis

Answer 7

Move vertebral column, extend neck

Question 8

Splenius cervicis

Answer 8

Move vertebral column, extend neck

Question 9

Deep back muscles (errector spinae and transversospinalis)

Answer 9

Move vertebral column

Question 10

supraspinatus

Answer 10

*greater tubercle
0-15 degree abduction
Lateral rotation of arm

Question 11

Infraspinatus

Answer 11

*greater tubercle
Lateral rotation of arm

Question 12

Teres minor

Answer 12

*greater tubercle
Lateral rotation of arm

Question 13

Subscapularis

Answer 13

*lesser tubercle
Medial rotation of shoulder

Question 14

Subclavius

Answer 14

Steadies clavicle

Question 15

Deltoid

Answer 15

Intermediate fibers: 15-90 degree abduction
Posterior fibers: extend arm
Anterior fibers: flex arm

Question 16

Teres major

Answer 16

Adducts, extends, medially rotates humerus

Question 17

Biceps brachii

Answer 17

All: flex, supinate forearm
LH: also flexes, ABDUCTS, medially rotates humerus

Question 18

Brachialis

Answer 18

Flexes forearm, mobilizer of elbow

Question 19

Coracobrachialis

Answer 19

Flexes arm, weak adductor

Question 20

Brachioradialis

Answer 20

Flexes forearm, stabilizer of elbow

Question 21

Extensor carpi radialis longus and brevis

Answer 21

Extend and abduct wrist

Question 22

Extensor digitorum

Answer 22

Extend wrist and fingers

Question 23

Extensor carpi ulnaris

Answer 23

Extend and adduct wrist

Question 24

Supinator

Answer 24

Supinates forearm

Question 25

Abductor pollicis longus

Answer 25

Abduct and extend thumb at CMC joint

Question 26

Extensor pollicis brevis

Answer 26

Extend wrist and thumb at MCP

Question 27

Extensor pollicis longus

Answer 27

Extend wrist and thumb at MCP and all IP joints

Question 28

Extensor indicis

Answer 28

Extend 2nd digit

Question 29

Extensor digiti minimi

Answer 29

Extends wrist and 5th digit

Question 30

Flexor carpi radialis

Answer 30

Flex wrist, ABDUCT hand

Question 31

Pronator teres

Answer 31

Pronate and flex forearm

Question 32

Palmaris longus

Answer 32

Flex wrist and tense palmar aponeurosis

Question 33

Flexor digitorum superificalis

Answer 33

Flex wrist, int, and prox, phalanges

Question 34

Flexor carpi ulnaris

Answer 34

Flex wrist and ADDUCT hand

Question 35

Flexor digitorum profundus

Answer 35

Flex wrist, prox, int, and distal phalanges

Question 36

Pronator quadratus

Answer 36

Pronates hand

Question 37

Flexor pollicis longus

Answer 37

Flex wrist, prox and dist phalanges of pollex

Question 38

Pectoralis major

Answer 38

Adducts and medially rotates arm

Question 39

Pectoralis minor

Answer 39

Protracts scapula (scapula away from spine)

Question 40

Abductor pollicis brevis

Answer 40

Abduct pollex

Question 41

Flexor pollicis brevis

Answer 41

Flex pollex, medially rotates 1st MCP

Question 42

Opponens pollicis

Answer 42

Opposes thumb

Question 43

Opponens digiti minimi

Answer 43

Flex and laterally rotates 5th MCP join

Question 44

Flexor digiti minimi

Answer 44

Flex 5th digit at MCP joint

Question 45

Abductor digiti minimi

Answer 45

Abduct 5th digit

Question 46

Lumbricals

Answer 46

Flex MCP joint / extend IP joints

Question 47

Palmar interosseus

Answer 47

PAD Adduct fingers, flex MCP, extend IP

Question 48

Dorsal interosseus

Answer 48

DAB Abduct fingers, flex MCP, extend IP

Question 49

External intercostal muscle

Answer 49

Elevates ribs during forced inspiration

Question 50

Internal and innermost intercostal muscles

Answer 50

Depress ribs during forced expiration

Question 51

Transversus thoracis muscle

Answer 51

Depresses ribs during forced expiration