Appendicular Muscle Actions

Question 1

serratus anterior action

Answer 1

• protracts scapula (throwing a punch)

- stabilize and holds scapula flush to body wall

Question 2

upper trapezius action

Answer 2

-elevates pectoral girdle

Question 3

middle trapezius action

Answer 3

• retract scapula (pulls posteriorly)

- some head extension

Question 4

lower trapezius action

Answer 4

-depress pectoral girdle

Question 5

pectoralis major action

Answer 5

• abducts arm (downward motion)

- arm flexion

Question 6

latissimus dorsi action

Answer 6

• arm adduction
• arm abduction/extension
• arm rotation internal/externally

Question 7

teres major action

Answer 7

• good for fine movement and stability

- works w/ latissimus dorsi but with less force

Question 8

deltoid action

Answer 8

• moves the humerus
• anterior : flexes
• lateral: abducts
• posterior: extends

Question 9

rotator cuff supraspinatus action

Answer 9

-first 15° of arm abduction

Question 10

rotator cuff infraspinatus action

Answer 10

• not powerful muscle

- adducts of arm

Question 11

rotator cuff teres minor action

Answer 11

• adduction of the arm

- not powerful muscle

Question 12

rotator cuff subscapularis action

Answer 12

-internal rotation and adduction of arm

Question 13

biceps brachii action

Answer 13

-flex forearm

Question 14

brachialis action

Answer 14

-flex forearm

Question 15

brachioradialis action

Answer 15

• one of the reflex center

- flexes the forearm

Question 16

triceps brachii action

Answer 16

-extensor of the forearm

Question 17

supinator action

Answer 17

-supinates forearm

Question 18

pronator teres action

Answer 18

• rotates forearm

- pronates

Question 19

pronator quadratus action

Answer 19

• rotates forearm

- pronates

Question 20

flexor carpi radialis action

Answer 20

-radial flexion

Question 21

flexor carpi ulnaris action

Answer 21

-ulnar flexion

Question 22

flexor digitorum superficialis action

Answer 22

-flex the fingers (digits II-V)

Question 23

flexor digitorum profundus action

Answer 23

-flex the fingers (digits II-V)

Question 24

flexor pollicis longus action

Answer 24

-flexes the thumb

Question 25

extensor carpi radialis longus action

Answer 25

- helps move hand - facilitates movement at wrist - involved in extending and abducting the hand at wrist

Question 26

extensor carpi ulnaris action

Answer 26

-extends and adducts at the carpus/wrist from anatomical position

Question 27

extensor digitorum action

Answer 27

-extends digits

Question 28

thenar muscles action

Answer 28

-moves thumb

Question 29

hypothenar muscles action

Answer 29

-moves pinkie

Question 30

lumbricals action

Answer 30

- flex at metacarpophalangeal joint (II-V) | - extend interphalangeal joints (II-V)

Question 31

dorsal interossei action

Answer 31

-abduct digits

Question 32

palmar interossei action

Answer 32

-adduct digits

Question 33

iliacus action

Answer 33

-flex the thigh at the hip

Question 34

psoas major action

Answer 34

-share a common tendon

Question 35

tensor fascia lata action

Answer 35

- abducts and flexes the thigh | - pulls it anteriorly and laterally

Question 36

gluteus maximus action

Answer 36

-thigh extension

Question 37

gluteus medius action

Answer 37

-abduct and internally rotate thigh

Question 38

adductor magnus action

Answer 38

-adduct and internally rotate thigh

Question 39

sartorius action

Answer 39

- crossing the leg - ->flexion at hip - ->flexion at knee - ->external rotation at hip

Question 40

rectus femoris action

Answer 40

- extends the knee | - flexes the thigh at the hip

Question 41

vastus lateralis action

Answer 41

- extends the knee joint | - moves the lower leg forward

Question 42

vastus intermedius action

Answer 42

-extension of knee

Question 43

vastus medialis action

Answer 43

- knee extension | - contributes to correct tracking of the patella

Question 44

hamstrings group action

Answer 44

- flex the leg at the knee (opposite of the knee) | - extends thigh at the hip

Question 45

tibialis anterior action

Answer 45

- dorsiflexion | - inversion

Question 46

extensor digitorum longus action

Answer 46

-extends digits (II-V)

Question 47

gastrocnemius action

Answer 47

- plantar flexes the foot at the ankle joint | - flexes the leg at the knee joint

Question 48

soleus action

Answer 48

-plantar flexion of foot

Question 49

tibialis posterior action

Answer 49

- invert and plantar flex - flex digits II-V - flex the hallux

Question 50

flexor hallucis longus action

Answer 50

-flexes the hallux