Muscles And Their Actions

Question 1

Actions of Quadratus Lumborum

Answer 1

Stabilization of 12th rib during inspiration
-Unilateral action-
Lateral flexion of trunk
Elevation of pelvis while thorax and vertebral column are fixed

Question 2

Actions of Rectus Abdominis

Answer 2

Flexion of trunk

Compression and Support of AV

Question 3

Actions of External Oblique

Answer 3

Flexion of Trunk
Compression and Support of AV
-Unilateral actions-
Lateral Flexion of Trunk
Rotation of trunk to opposite side

Question 4

Actions of Internal Oblique

Answer 4

Flexion of trunk
Compression and Support of AV
-Unilateral actions-
Lateral flexion of trunk
Rotation of trunk to same side

Question 5

Actions of Transversus Abdominis

Answer 5

Compression and Support of AV

Question 6

Actions of Pyramidalis

Answer 6

Reinforce lower rectus sheath

Question 7

Actions of Sartorius

Answer 7

Flexion of femur 
Abduction of femur
Lateral rotation of femur
Flexion of knee
Medial rotation of tibia while knee is in flexion

Question 8

Actions of Iliopsoas

Answer 8

Flexion of trunk
Lateral flexion of trunk
Flexion of femur

Question 9

Actions of Rectus Femoris

Answer 9

Flexion of femur

Extension of knee

Question 10

Actions of Vastus Lateralis

Answer 10

Extension of knee

Question 11

Actions of Vastus Medialis

Answer 11

Extension of the knee

Question 12

Actions of Vastus Intermedius

Answer 12

Extension of knee

Question 13

Actions of Pectineus

Answer 13

Flexion of femur
Adduction of femur
Medial rotation of femur

Question 14

Actions of adductor longus

Answer 14

Flexion of femur

Adduction of femur

Question 15

Actions of adductor brevis

Answer 15

Flexion of femur

Adduction of femur

Question 16

Actions of Adductor Magnus

Answer 16

Adduction of femur
Anterior head:
Flexion of femur
Medial rotation of femur
Posterior head:
Extension of femur
Lateral rotation of femur

Question 17

Actions of Gracilis

Answer 17

Adduction of femur
Flexion of femur
Medial rotation of tibia when knee is in flexion

Question 18

Actions of Gluteus Maximus

Answer 18

Extension of femur

Lateral rotation of extended hip

Question 19

Actions of Gluteus Medius

Answer 19

Abduction of femur
Prevent contralateral hip drop while walking
Anterior fibers:
Medial rotation of femur

Question 20

Actions of Gluteus Minimus

Answer 20

Abduction

Medial rotation of femur

Question 21

Actions of Tensor Fasciae Latae

Answer 21

Flexion of femur
Abduction of femur
Medial rotation of femur
Extension of knee
Stability of extended knee while standing and walking

Question 22

Actions of Piriformis

Answer 22

Lateral rotation of hip joint

Abduction when hip is flexed

Question 23

Actions of Quadratus Femoris

Answer 23

Lateral rotation of hip joint

Adduction of hip joint

Question 24

Actions of Obturator Internus

Answer 24

Lateral rotation of hip

Abduction when hip is flexed

Question 25

Actions of Obturator Externus

Answer 25

Lateral rotation of hip | Adduction of hip joint

Question 26

Actions of Gemellus Superior

Answer 26

Lateral rotation of hip | Abduction when hip is flexed

Question 27

Actions of Gemellus Inferior

Answer 27

Lateral rotation of hip | Abduction when hip is flexed

Question 28

Actions of Biceps Femoris

Answer 28

Flexion of knee Lateral rotation of tibia when knee is in flexion Long head: Extension of femur

Question 29

Actions of Semimembranosus

Answer 29

Extension of femur Flexion of knee Medial rotation of tibia when knee is in flexion

Question 30

Actions of Semitendinosus

Answer 30

Extension of Femur Flexion of knee Medial rotation of tibia while knee is in flexion

Question 31

Actions of Tibialis Anterior

Answer 31

Dorsiflexion of ankle | Inversion of foot

Question 32

Actions of Extensor digitorum longus

Answer 32

Dorsiflexion of ankle | Extension of 4 lateral toes at MP joints

Question 33

Actions of Extensor Hallicus longus

Answer 33

Dorsiflexion of ankle | Extension of great toe at MP and IP joints

Question 34

Actions of Fibularis Tertius

Answer 34

Dorsiflexion of ankle | Eversion of foot

Question 35

Actions of Fibularis Longus

Answer 35

Plantarflexion of ankle | Eversion of foot

Question 36

Actions of Fibularis Brevis

Answer 36

Plantarflexion of ankle | Eversion of foot

Question 37

Actions of gastrocnemius

Answer 37

Flexion of knee | Plantarflexion of ankle

Question 38

Actions of Soleus

Answer 38

Plantarflexion of ankle

Question 39

Actions of Tibialis Posterior

Answer 39

Plantarflexion of ankle | Inversion of foot

Question 40

Actions of Flexor Digitorum Longus

Answer 40

Plantarflexion of ankle | Flexion of 4 lateral toes at MP and IP joints

Question 41

Actions of Flexor Hallicus Longus

Answer 41

Plantarflexion of ankle | Flexion of great toe at IP and MP joints

Question 42

Actions of Plantaris

Answer 42

Flexion of knee | Plantarflexion of ankle

Question 43

Actions of Popliteus

Answer 43

Lateral rotation of femur to initiate knee flexion OR Medial rotation of tibia

Question 44

Actions of Extensor Digitorum Brevis

Answer 44

Extension of 4 lateral toes at MP and IP joints