LE Muscles - Actions

Question 1

Iliacus

Answer 1

actions- flexes thigh and stabilizes hip joint

Question 2

Psoas (L. muscle of the loin)

Answer 2

actions- flexes thigh and stabilizes hip joint

Question 3

Rectus femoris (L2, 3, 4) (L. straight)

Answer 3

actions- flexes thigh, and extends leg

Question 4

Sartorius (L. sartor, a tailor)

Answer 4

actions- flexes, abducts & laterally rotates thigh, and flexes leg

Question 5

Tensor fasciae latae

Answer 5

actions- abducts, flexes & medially rotates thigh, and assists in maintaining extended leg

Question 6

Vastus intermedius (L2, 3, 4)

Answer 6

actions- extends leg

Question 7

Vastus lateralis (L2, 3, 4)

Answer 7

actions- extends leg

Question 8

Vastus medialis (L2, 3, 4)

Answer 8

actions- extends leg

Question 9

Adductor brevis

Answer 9

actions- adducts thigh

Question 10

Adductor longus

Answer 10

actions- adducts & flexes thigh

Question 11

Adductor magnus

Answer 11

actions- adducts (adductor part) & extends (hamstring part) thigh

Question 12

Gracilis (L. scanty)

Answer 12

actions- flexes & medially rotates the leg, and adducts thigh

Question 13

Pectineus

Answer 13

actions- adducts & flexes thigh

Question 14

Obturator externus

Answer 14

actions- laterally rotates thigh

Question 15

Gemellus inferior (L. twin)

Answer 15

actions- laterally rotates thigh

Question 16

Gemellus superior

Answer 16

actions- laterally rotates thigh

Question 17

Gluteus maximus

Answer 17

actions- extends & laterally rotates thigh, & tenses fascia lata (iliotibial tract)

Question 18

Gluteus medius

Answer 18

actions- abducts & medially rotates thigh; and keeps the pelvis level when opposite leg is raised

Question 19

Gluteus minimis

Answer 19

actions- abducts & medially rotates thigh; and keeps the pelvis level when opposite leg is raised

Question 20

Obturator internus

Answer 20

actions- laterally rotates thigh

Question 21

Piriformis

Answer 21

actions- abducts & laterally rotates thigh

Question 22

Quadratus femoris

Answer 22

actions- laterally rotates thigh

Question 23

Biceps femoris

Answer 23

actions- flexes leg (both heads) & extends thigh (long head only)

Question 24

Semimembranosus

Answer 24

actions- extends thigh & flexes leg

Question 25

Semitendinosus

Answer 25

actions- extends thigh & flexes leg

Question 26

Extensor digitorum longus

Answer 26

actions- dorsiflexes ankle, and extends digits 2-5 (IP & MP)

Question 27

Extensor hallucis longus (L. hallex, great toe)

Answer 27

actions- dorsiflexes ankle, and extends great toe (MP & IP)

Question 28

Peroneus tertius

Answer 28

actions- dorsiflexes ankle, and everts foot

Question 29

Tibialis anterior

Answer 29

actions- dorsiflexes ankle, and inverts foot

Question 30

Peroneus longus

Answer 30

actions- plantar flexes ankle, and everts foot

Question 31

Peroneus brevis

Answer 31

actions- plantar flexes ankle, and everts foot

Question 32

Flexor digitorum longus

Answer 32

actions- plantar flexes ankle, and flexes digits 2-5 (MP & IP)

Question 33

Flexor hallucis longus

Answer 33

actions- plantar flexes ankle, and flexes great toe (MP & IP)

Question 34

Gastrocnemius (S1,2) (G. gaster, belly + kneme, leg)

Answer 34

actions- flexes leg, and plantar flexes ankle

Question 35

Plantaris (L. planta, sole)

Answer 35

actions- flexes leg, and plantar flexes ankle

Question 36

Popliteus

Answer 36

actions- unlocks knee during (initial) flexion

Question 37

Soleus (S1,2)

Answer 37

actions- plantar flexes ankle

Question 38

Tibialis posterior

Answer 38

actions- plantar flexes ankle, and inverts foot

Question 39

Abductor digiti minimi

Answer 39

actions- abducts & flexes 5th digit

Question 40

Abductor halluces

Answer 40

actions- flexes & abducts great toe

Question 41

Adductor halluces

Answer 41

actions- adducts great toe

Question 42

Extensor digitorum brevis

Answer 42

actions- extension of digits 2-5 (MP & IP)

Question 43

Extensor hallucis brevis

Answer 43

actions- extension of great toe (MP)

Question 44

Flexor digitorum accessories

Answer 44

actions- assists flexor digitorum longus

Question 45

Flexor digitorum brevis

Answer 45

actions- flexes toes (proximal IP)

Question 46

Flexor digiti minimi

Answer 46

actions- flexion of 5th digit (MP)

Question 47

Flexor hallucis brevis

Answer 47

actions- flexion of great toe (MP)

Question 48

Interossei-dorsal

Answer 48

actions- abducts (MP) & flexes (MP) & extends (IP) digits 2-4

Question 49

Interossei-plantar

Answer 49

actions- adducts & flexes (MP) & extends (IP) digits 3-5

Question 50

Lumbricals

Answer 50

actions- flexes proximal phalanges (MP), and extend IP joints