Muscle Actions

Question 1

Obturator internus (2)

Answer 1

Lateral rotation of thigh
Holds head of femur in acetabulum

Question 2

Piriformis (2)

Answer 2

Lateral rotation of thigh
Holds head of femur in acetabulum

Question 3

Iliopsoas (1)

Answer 3

Powerful flexion of the hip

Question 4

Sartorius (2)

Answer 4

Flexes and laterally rotates thigh
Flexes and medially rotates leg

Question 5

Tensor fascia lata (1)

Answer 5

Abducts, medially rotates, and flexes thigh

Question 6

Quadriceps femoris group (2)

Answer 6

Extends leg
Flexes thigh (rectus femoris only)

Question 7

Pectineus (1)

Answer 7

Adducts and flexes thigh

Question 8

Gracilis (2)

Answer 8

Adduction of thigh
Flexes and medially rotates leg

Question 9

Adductor longus (1)

Answer 9

Adducts thigh

Question 10

Adductor brevis (1)

Answer 10

Adducts thigh

Question 11

Adductor magnus (3)

Answer 11

Adducts thigh
Adductor: flexes thigh
Hamstring: extends thigh

Question 12

Obturator externus (1)

Answer 12

Laterally rotates thigh

Question 13

Gluteus maximus (1)

Answer 13

Extends and laterally rotates thigh

Question 14

Gluteus medius (1)

Answer 14

Abducts and medially rotates thigh

Question 15

Gluteus minimus (1)

Answer 15

Abducts and medially rotates thigh

Question 16

Quadratus femoris (1)

Answer 16

Laterally rotates thigh

Question 17

Superior gemellus (1)

Answer 17

Laterally rotates thigh

Question 18

Inferior gemellus (1)

Answer 18

Laterally rotates thigh

Question 19

Biceps femoris (2)

Answer 19

Extends thigh (long)
Flexes leg and laterally rotates leg when knee is flexed (long and short)

Question 20

Semitendinosus (2)

Answer 20

Extends thigh
Flexes leg and medially rotates leg when flexed

Question 21

Semimembranosus (2)

Answer 21

Extends thigh
Flexes leg and medially rotates leg when flexed

Question 22

Anterior tibialis (1)

Answer 22

Dorsiflexes and inverts foot

Question 23

Extensor digitorum longus (2)

Answer 23

Extends lateral 4 digits
Dorsiflexes ankle

Question 24

Extensor hallucis longus (2)

Answer 24

Extends hallux
Dorsiflex ankle

Question 25

Fibularis tertius (2)

Answer 25

Weakly dorsiflexes ankle Eversion of foot

Question 26

Fibularis longus (2)

Answer 26

Everts foot Plantarflexes ankle

Question 27

Fibularis brevis (2)

Answer 27

Everts foot Plantarflexes ankle

Question 28

Gastrocnemius (3)

Answer 28

Plantarflexes ankle when knee is extended Raises heel during walking Flexes leg at knee

Question 29

Soleus (2)

Answer 29

Plantarflexes ankle independent of position of the knee Steadies leg on foot

Question 30

Plantaris (2)

Answer 30

Assists in plantarflexion of ankle Flexion of knee

Question 31

Flexor digitorum longus (3)

Answer 31

Flexes later 4 digits Plantarflexes ankle Supports longitudinal arch of foot

Question 32

Popliteus (1)

Answer 32

Laterally rotate femur when foot is fixed

Question 33

Flexor hallucis longus (3)

Answer 33

Flexes hallux Plantarflexes ankle Supports medial longitudinal arch of foot

Question 34

Tibialis posterior (3)

Answer 34

Plantarflexes ankle Inverts foot Supports medial arch of foot

Question 35

Extensor digitorum brevis (1)

Answer 35

Extends proximal interphalangeal joints of digits 2-5

Question 36

Extensor hallucis brevis (1)

Answer 36

Extends metatarsophalangeal joint of digit 1

Question 37

Abductor hallucis (1)

Answer 37

Abduct and flex hallux

Question 38

Flexor digitorum longus (1)

Answer 38

Flexes digits 2-5

Question 39

Abductor digiti minimi (1)

Answer 39

Abducts and flexes digit 5

Question 40

Lumbricals (2)

Answer 40

Flexes metatarsophalangeal joints Extends interphalangeal joints of digits 2-5

Question 41

Quadratus plantae (1)

Answer 41

Assists in flexion of digits 2-5

Question 42

Flexor hallucis brevis (1)

Answer 42

Flexes digit 1

Question 43

Adductor hallucis (1)

Answer 43

Adducts hallux

Question 44

Adductor digiti minimi (1)

Answer 44

Flexes metatarsophalangeal joint of digit 5

Question 45

Plantar interossei (1)

Answer 45

Adducts digits 3-5

Question 46

Dorsal interossei (1)

Answer 46

Abducts digits 2-4