Muscles and Specific Action

Question 1

Frontal belly of occipitofrontalis (Facial Expression)

Answer 1

Raises eyebrows and wrinkles forehead

Question 2

Orbicularis oculi (Facial Expression)

Answer 2

Closes eye

Question 3

Zygomaticus major (Facial Expression)

Answer 3

Draws angle of mouth upward (elevates) and laterally (retracts) as in laughing

Question 4

Orbicularis oris (Facial Expression)

Answer 4

Closes and protrudes lips (pucker)

Question 5

Sternocleidomastoid (Move Head & Neck)

Answer 5

Flexion of neck and head if bilateral contraction

Lateral flexion and contralateral rotation if one side contracts

Question 6

Diaphragm (Breathing)

Answer 6

Primary muscle for inspiration

Question 7

External intercostals (Breathing)

Answer 7

Primary muscle for inspiration

Question 8

Internal intercostals (Breathing)

Answer 8

Primary muscle for inspiration

Question 9

Deltoid (Move arm/brachium)

Answer 9

Abducts shoulder joint

Can flex or extend at shoulder

Question 10

Supraspinatus (Rotator cuff and Moving arm/brachium)

Answer 10

Abducts arm at shoulder joint

Question 11

Biceps brachii (long and short head and Moving forearm)

Answer 11

Flexes elbow and supinates forearm at proximal radio-ulnar joint

Question 12

Brachialis (Move the forearm)

Answer 12

Flexes elbow joint

Question 13

Pronator teres (Move the forearm)

Answer 13

Pronates and slightly flexes forearm

Question 14

Supinator (Move the forearm)

Answer 14

Supinates forearm

Question 15

Flexor digitorum superficialis (Move wrist &/or fingers)

Answer 15

Flexion of fingers & wrist

Question 16

Flexor digitorum profundus (Move wrist &/or fingers)

Answer 16

Flexes distal phalanges

Question 17

Flexor pollicus longus (Move wrist &/or fingers)

Answer 17

Flexion of thumb

Question 18

Extensor digitorum (Move wrist &/or fingers)

Answer 18

Extends fingers and wrist

Question 19

Extensor digiti minimi (Move wrist &/or fingers)

Answer 19

Extends 5th digit

Question 20

Gluteus maximus (Move the thigh)

Answer 20

Extends and laterally rotates hip joint

Helps tense iliotibial band to laterally support knee

Question 21

Psoas major (Move the thigh)

Answer 21

Flexion of thigh at hip

Flex lumbar spine if hip is stabilized

Question 22

Iliacus (Move the thigh)

Answer 22

Flexion of thigh at hip

Tendon fuses with psoas major to form “iliopsoas”

Question 23

Adductor longus (Move the thigh)

Answer 23

Adducts, flexes and helps to medially rotate femur

Question 24

Adductor brevis

Answer 24

Pull the thigh medially

Question 25

Adductor magnus (Move the thigh)

Answer 25

Adducts, extends and may help rotate hip joint

Question 26

Rectus femoris (quadriceps femoris and Move thigh &/or leg)

Answer 26

Flexes hip joint and extends at knee joint

Question 27

Vastus medialis (quadriceps femoris and Move thigh &/or leg)

Answer 27

Extends at knee joint

Question 28

Vastus lateralis (quadriceps femoris and Move thigh &/or leg)

Answer 28

Extends at knee joint

Question 29

Vastus intermedius (quadriceps femoris and Move thigh &/or leg)

Answer 29

Extends at knee joint

Question 30

Biceps femoris (hamstrings and Move thigh &/or leg)

Answer 30

Extends at hip joint (long head only) and flexes at knee joint

Question 31

Semitendinosus (hamstrings and Move thigh &/or leg)

Answer 31

Extends hip joint and flexes at knee joint

Question 32

Semimembranosus (hamstrings and Move thigh &/or leg)

Answer 32

Extends hip joint and flexes at knee joint

Question 33

Popliteus (Move thigh &/or leg)

Answer 33

Medial rotation of tibia at knee to help “unlock” knee after standing

Question 34

Tibialis anterior

Answer 34

Dorsiflexes at ankle

Question 35

Gastrocnemius (Move the ankle/foot/toes)

Answer 35

Plantar flexes at ankle and also causes flexion at knee