Muscles: Actions

Question 0

Latissimus Dorsi

Answer 0

Extends, adducts, medially rotates humerus

Raises torso towards arms during climbing

Question 1

Trapezius

Answer 1

Elevation/upward rotation of scapula
Retracts scapula
Depression/upward rotation of scapula

Question 2

Rhomboid Major

Answer 2

Retract, elevate, rotate scapula downward

Fix scapula to thoracic wall

Question 3

Rhomboid Minor

Answer 3

Retract, elevate, rotate scapula downward

Fix scapula to thoracic wall

Question 4

Levator Scapulae

Answer 4

Elevates scapula

Tilts glenoid fossa inferiorly by rotating scapula

Question 5

Serratus Posterior Superior

Answer 5

Elevates ribs

Question 6

Serratus Posterior Inferior

Answer 6

Depress ribs

Question 7

Splenius

Answer 7

Bilaterally: extend head & neck
Unilaterally: laterally flex neck/rotate head

Question 8

Iliocostalis

Answer 8

Bilaterally: extend vertebral column, head
Unilaterally: laterally flex vertebral column

Question 9

Longissimus

Answer 9

Bilaterally: extend vertebral column, head
Unilaterally: laterally flex vertebral column

Question 10

Spinals

Answer 10

Bilaterally: extend vertebral column, head
Unilaterally: laterally flex vertebral column

Question 11

Semispinalis

Answer 11

Extend head, thoracic, cervical regions

Rotate them contralaterally

Question 12

Multifidus

Answer 12

Stabilize vertebrae during localized movement of vertebral column

Question 13

Rotatores

Answer 13

Extend head, thoracic, cervical regions

Rotate them contralaterally

Question 14

Rectus Capitis Posterior Minor

Answer 14

Extension of head

Question 15

Rectus Capitis Posterior Major

Answer 15

extension/ipsilateral rotation of head

Question 16

Obliquus Capitis Inferior

Answer 16

Ipsilateral rotation of head

Question 17

Obliquus Capitis Superior

Answer 17

Extension/ipsilateral rotation of head

Question 18

Pectoralis Major

Answer 18

adduct/medially rotate humerus
Draw scapula anterior/inferior
Clavicular portion flexes humerus
Sternal portion extends humerus when flexed

Question 19

Pectoralis Minor

Answer 19

Stabilize scapula by pulling anterior/inferior against posterior thoracic wall

Question 20

Subclavius

Answer 20

Anchor and depress clavicle

Question 21

Serratus Anterior

Answer 21

Protract/rotate/hold scapula against thorax

Question 22

Deltoid

Answer 22

Flex/medially rotate, abduct, extend, & laterally rotate humerus

Question 23

Teres Major

Answer 23

Adducts/medially rotates humerus

Question 24

Supraspinatus

Answer 24

Abduction of humerus/stabilize shoulder joint

Question 25

Subscapularis

Answer 25

Medially rotate/adduct humerus | Hold humeral head in place

Question 26

Infraspinatus

Answer 26

Laterally rotate humerus, help hold humeral head in place

Question 27

Teres Minor

Answer 27

Laterally rotate humerus, help hold humeral head in place

Question 28

Biceps brachii

Answer 28

Supinate forearm Flex forearm when supine Resist shoulder dislocation

Question 29

Coracobrachialis

Answer 29

Flex/adduct arm at shoulder | Resist shoulder dislocation

Question 30

Brachialis

Answer 30

Flex forearm at elbow

Question 31

Triceps Brachii

Answer 31

Extend forearm at elbow | Resist dislocation of shoulder

Question 32

Anconeus

Answer 32

Extension of forearm/stabilize elbow | Abducts ulna during pronation

Question 33

Pronator Teres

Answer 33

Pronates/flexes forearm at elbow

Question 34

Flexor Carpi Radialis

Answer 34

Flexes/abducts (radially deviates) hand at wrist

Question 35

Palmaris Longus

Answer 35

Flexes hand at wrist | Tenses palmar aponeurosis

Question 36

Flexor Carpi Ulnaris

Answer 36

Flexes/adducts (ulnarly deviates) hand at wrist

Question 37

Flexor Digitorum Superficialis

Answer 37

Flexes middle phalanges at proximal interphalangeal joint | Flexes proximal phalanges at metacarpophalangeal joints

Question 38

Flexor Digitorum Profundus

Answer 38

Flexes distal phalanges at interphalangeal joints

Question 39

Flexor Pollicis Longus

Answer 39

Flexes thumb

Question 40

Pronator Quadratus

Answer 40

Pronates forearm, binds radius/ulna together

Question 41

Brachioradialis

Answer 41

Flexes forearm when pronated

Question 42

Extensor Carpi Radialis Longus

Answer 42

Extend/abduct hand at wrist

Question 43

Extensor Carpi Radialis Brevis

Answer 43

Extend/abducts hand at wrist

Question 44

Extensor Digitorum

Answer 44

Extends medial 4 fingers at metacarpophalangeal joints | somewhat at interphalangeal joints

Question 45

Extensor Digit Minimi

Answer 45

Extends 5th finger at metacarphophalangeal and interphalangeal joints

Question 46

Extensor Carpi Ulnaris

Answer 46

Extends/adducts hand at wrist

Question 47

Supinator

Answer 47

Supinates forearm

Question 48

Extensor Indicis

Answer 48

Independent extension of 2nd finger & extension of wrist

Question 49

Abductor Pollicis Longus

Answer 49

Abducts thumb/extends it at carpometacarpal joint

Question 50

Extensor Pollicis Brevis

Answer 50

Extends proximal phalanx of thumb at metacarpophalangeal joint & extends carpometacarpal joint

Question 51

Extensor Pollicis Longus

Answer 51

Extends distal phalanx of thumb at interphalangeal joint & extends the metacarpophalangeal/carpometacarpal joints

Question 52

Abductor Pollicis Brevis

Answer 52

Abduct thumb, aid in opposition

Question 53

Flexor Pollicis Brevis

Answer 53

Flexes thumb

Question 54

Opponens Pollicis

Answer 54

Oppose thumb/medially rotate 1st metacarpal

Question 55

Adductor Pollicis

Answer 55

Adducts thumb toward lateral border of palm

Question 56

Flexor Digit Minimi

Answer 56

Abducts 5th digit, aids in flexion of 5th proximal phalanx

Question 57

Abductor Digiti Minimi

Answer 57

Flexes proximal phalanx of digit 5

Question 58

Opponens Digiti Minimi

Answer 58

Brings 5th metacarpal anterior & rotates it to bring it into opposition with thumb

Question 59

Palmer Interossei

Answer 59

Adduct 2nd, 4th, & 5th fingers toward axial line

Question 60

Dorsal Interossei

Answer 60

Abduct 2nd, 3rd, & 4th fingers toward axial line