Muscle Actions

Question 1

which muscles flex the shoulder?

Answer 1

deltoid (anterior fibers)
biceps brachii
pectoralis major (upper fibers)

Question 2

which muscles extend the shoulder?

Answer 2

teres major
deltoid (posterior fibers)
latissimus dorsi
triceps brachii (long head)
pectoralis major (lower fibers)

Question 3

which muscles abduct the shoulder?

Answer 3

supraspinatus
deltoid (all fibers)

Question 4

which muscles adduct the shoulder?

Answer 4

teres major
infraspinatus
teres minor
latissimus dorsi
triceps brachii (long head)
pectoralis major (all fibers)

Question 5

which muscles horizontally abduct the shoulder?

Answer 5

deltoid (posterior fibers)

Question 6

which muscles horizontally adduct the shoulder?

Answer 6

deltoid (anterior fibers)
pectoralis major (upper fibers)

Question 7

which muscles medially rotate the shoulder?

Answer 7

teres major
subscapularis
deltoid (anterior fibers)
latissimus dorsi
pectoralis major (all fibers)

Question 8

which muscles stabilize the head of the humerus in the glenoid cavity?

Answer 8

supraspinatus
infraspinatus
teres minor
subscapularis

Question 9

which muscles laterally rotate the shoulder?

Answer 9

infraspinatus
teres minor
deltoid (posterior fibers)

Question 10

which muscles flex the hip?

Answer 10

rectus femoris
TFL
anterior fibers of glute med
iliopsoas (with origin fixed)

Question 11

which muscles extend the hip?

Answer 11

biceps femoris (long head)
semimembranosus
semitendinosus
glute max (all fibers)
glute med (posterior fibers)

Question 12

which muscles abduct the hip?

Answer 12

TFL
glute max (all fibers)
glute med (all fibers)

Question 13

which muscles adduct the hip?

Answer 13

glute max (lower fibers)
adductor longus

Question 14

which muscles medially rotate the hip?

Answer 14

TFL
glute med (anterior fibers)
adductor longus

Question 15

which muscles laterally rotate the hip?

Answer 15

glute max (all fibers)
glute med (posterior fibers)

Question 16

which muscles flex the knee?

Answer 16

gastrocnmeius
semimembranosus
semitendinosus
biceps femoris

Question 17

which muscles extend the knee?

Answer 17

rectus femoris
vastus group (lateralis, medialis, intermedius)

Question 18

which muscles medially rotate the flexed knee?

Answer 18

semimembranosus
semitendinosus

Question 19

which muscles laterally rotate the flexed knee?

Answer 19

biceps femoris

Question 21

which muscles plantarflex the ankle?

Answer 21

gastrocnemius
soleus

Question 21

which muscles dorsiflex the ankle?

Answer 21

EDL
tibialis anterior

Question 22

which muscles invert the foot?

Answer 22

tibialis anterior

Question 23

which muscles evert the foot?

Answer 23

EDL
fibularis longus

Question 24

which muscles extend 2nd to 5th toes?

Answer 24

EDL

Question 25

which muscles flex the elbow?

Answer 25

biceps brachii brachioradialis

Question 26

which muscles extend the elbow?

Answer 26

triceps brachii (all heads)

Question 27

which muscles pronate the forearm?

Answer 27

brachioradialis (assists when movement is resisted)

Question 28

which muscles supinate the forearm?

Answer 28

biceps brachii brachioradialis (assists when movement is resisted)

Question 29

which muscles tilt the pelvis posteriorly?

Answer 29

semimembranosus semitendinosus biceps femoris (long head) rectus abdominus

Question 30

which muscles tilt the pelvis anteriorly?

Answer 30

quadtratus lumborum iliospoas (with insertion fixed)

Question 31

which muscles flex the vertebral column?

Answer 31

rectus abdominus external obliques internal obliques Iliopsoas (with insertion fixed, flexes trunk toward the thigh - is this the same? I dont know)

Question 32

which muscles extend the vertebral column?

Answer 32

erector spinae group

Question 33

which muscles laterally flex the vertebral column?

Answer 33

quadratus lumborum (same side) external obliques (same side) internal obliques (same side)

Question 34

which muscles rotate the vertebral column to same side?

Answer 34

internal obliques

Question 35

which muscles rotate the vertebral column to opposite side?

Answer 35

external obliques

Question 36

which muscles flex the neck?

Answer 36

SCM scalenes (anterior only)

Question 37

which muscles extend the neck?

Answer 37

levator scapulae splenius capitus trapezius (upper fibers)

Question 38

which muscles laterally flex the neck to the same side?

Answer 38

SCM scalenes (all 3) levator scapulae splenius capitus trapezius (upper fibers)

Question 39

which muscles rotate the neck to same side?

Answer 39

levator scapulae splenius capitus

Question 40

which muscles rotate the neck to opposite side?

Answer 40

SCM scalenes (all 3) trapezius (upper fibers)

Question 40

which muscles fix the last rib during forced inhalation and exhalation?

Answer 40

quadratus lumborum

Question 41

which muscles draw ribs inferiorly/superiorly?

Answer 41

internal intercostals = inferiorly external intercostals = superiorly

Question 42

which muscles compress abdominal contents?

Answer 42

external obliques internal obliques

Question 43

which muscle draws down the central tendon and increases the volume of the thoracic cavity?

Answer 43

diaphragm

Question 44

which muscles elevate the ribs during inhalation?

Answer 44

scalenes (all 3)

Question 45

which muscles elevate the scapula?

Answer 45

levator scapulae trapezius (upper fibers) rhomboids

Question 46

which muscles depress the scapula?

Answer 46

trapezius (lower fibers)

Question 47

which muscles downwardly rotate the scapula?

Answer 47

levator scapulae rhomboids

Question 48

which muscles upwardly rotate the scapula?

Answer 48

trapezius (upper & lower fibers)

Question 49

which muscles stabilize the scapula?

Answer 49

trapezius (middle fibers)

Question 50

which muscles laterally flex the neck to the same side?

Answer 50

SCM scalenes (all 3) levator scapulae splenius capitus trapezius (upper fibers)

Question 51

which muscles adduct the scapula?

Answer 51

trapezius (middle fibers) rhomboids

Question 52

which muscles laterally tilt/elevate the pelvis?

Answer 52

quadratus lumborum