Leg Muscles

Question 1

muscles of anterior compartment of leg

Answer 1

tibialis anterior
extensor hallucis longus
entensor digitorum ongus
peroneus tertius

Question 2

tibialis anterior

-origin

Answer 2

lateral condyle of tibia

superior 1/2 of lateral tibia

Question 3

tibialis anterior

-insertion

Answer 3

medial and inferior surface of

• medial cuneiform
• 1st metatarsal

Question 4

tibialis anterior

-actions

Answer 4

foot dorsiflexion
foot inversion
supports the medial longitudinal arch

Question 5

tibialis anterior

-innervation

Answer 5

deep fibular nerve (L4, L5)

Question 6

extensor hallucis longus

-origin

Answer 6

middle part of anterior surface of fibula

interosseus membrane

Question 7

extensor hallucis longus

-insertion

Answer 7

dorsal aspect of base of distal phalanx of hallux

Question 8

extensor hallucis longus

-actions

Answer 8

hallux extension

foot dorsiflexion

Question 9

extensor hallucis longus

-innervation

Answer 9

deep fibular (L4, L5)

Question 10

entensor digitorum longus

-origin

Answer 10

lateral condyle of tibia
superior 3/4 of anterior surface of fibula
interosseus membrane

Question 11

entensor digitorum longus

-insertion

Answer 11

middle and distal phalanges of lateral 4 digits

Question 12

entensor digitorum longus

-actions

Answer 12

extends lateral 4 digits

dorsiflexes foot

Question 13

entensor digitorum longus

-innervation

Answer 13

deep fibular (L4, L5)

Question 14

peroneus (fibular) tertius

-origin

Answer 14

inferior 1/3 of anterior surface of fibula

interosseus membrane

Question 15

peroneus (fibular) tertius

-insertion

Answer 15

dorsum of base of 5th metatarsal

Question 16

peroneus (fibular) tertius

-actions

Answer 16

foot dorsiflexion

aids in foot eversion

Question 17

peroneus (fibular) tertius

-innervation

Answer 17

deep fibular (L4, L5)

Question 18

muscle of lateral compartment of leg

Answer 18

peroneus longus

peroneus brevis

Question 19

peroneus (fibular) longus

-origin

Answer 19

head and superior 2/3 of lateral surface of fibula

Question 20

peroneus (fibular) longus

-insertion

Answer 20

base of first metatarsal

medial cuneiform

Question 21

peroneus (fibular) longus

-actions

Answer 21

foot eversion
weak foot plantarflexion
tendon supports
-transverse arch
-medial longitudinal arch
-lateral longitudinal arch

Question 22

peroneus (fibular) longus

-innervation

Answer 22

superficial fibular (L5, S1, S2)

Question 23

peroneus brevis

-origin

Answer 23

inferior 2/3 of lateral surface of fibula

Question 24

peroneus brevis

-insertion

Answer 24

dorsal surface of tuberosity on lateral side of base of 5th metatarsal

Question 25

peroneus brevis | -actions

Answer 25

foot eversion | weak plantarflexion

Question 26

peroneus brevis | -innervation

Answer 26

superficial fibular nerve (L5, S1, S2)

Question 27

muscles of the superficial posterior compartment of the leg

Answer 27

gastrocnemius soleus plantaris

Question 28

gastrocnemius | -origin

Answer 28

lateral head -lateral aspect of lateral condyle of femur medial head -popliteal surface of femur, superior to medial condyle

Question 29

gastrocnemius | -insertion

Answer 29

posterior surface of calcaneus via tendo calcaneus

Question 30

gastrocnemius | -actions

Answer 30

plantar flexes foot raises heel during walking flexes knee

Question 31

gastrocnemius | -innervation

Answer 31

tibial nerve (S1, S2)

Question 32

soleus | -origin

Answer 32

posterior aspect of head of fibula superior 1/4 of fibula soleal line medial border of tibia

Question 33

soleus | -insertion

Answer 33

posterior surface of calcaneus via tendo calcaneus

Question 34

soleus | -actions

Answer 34

plantar flexes foot | raises heel during walking

Question 35

soleus | -innervation

Answer 35

tibial nerve (S1, S2)

Question 36

plantaris | -origin

Answer 36

inferior end of lateral supracondylar line of femur | oblique popliteal ligament

Question 37

plantaris | -insertion

Answer 37

fuses with tendo calcaneus

Question 38

plantaris | -action

Answer 38

weakly assists in plantarflexion and flexion of knee

Question 39

plantaris | -innervation

Answer 39

tibial nerve (S1, S2)

Question 40

muscles of the deep posterior compartment of the leg

Answer 40

popliteus flexor hallucis longus flexor digitorum longus tibialis posterior

Question 41

popliteus | -origin

Answer 41

lateral surface of lateral condyle of femur and lateral meniscus

Question 42

popliteus | -insertion

Answer 42

posterior surface of tibia superior to soleal line

Question 43

popliteus | -actions

Answer 43

weakly flexes knee unlocks knee -rotates femur laterally on fixed tibia -rotates tibia medially on fixed femur

Question 44

popliteus | -innervation

Answer 44

tibial nerve (L4, L5, S1)

Question 45

flexor hallucis longus | -origin

Answer 45

inferior 2/3 of posterior surface of fibula | inferior part of interosseus membrane

Question 46

flexor hallucis longus | -insertion

Answer 46

base of distal phalanx of hallux

Question 47

flexor hallucis longus | -action

Answer 47

flexes hallux at all joints plantar flexes foot supports longitudinal arch of foot

Question 48

flexor hallucis longus | -innervation

Answer 48

tibial nerve (S2, S3)

Question 49

flexor digitorum longus | -origin

Answer 49

medial part of posterior surface of tibia inferior to soleal line to fibula via broad aponeurosis

Question 50

flexor digitorum longus | -insertion

Answer 50

bases of distal phalanges of lateral 4 digits

Question 51

flexor digitorum longus | -actions

Answer 51

flexes lateral 4 digits plantarflexes foot suports medial longitudinal arch of foot

Question 52

flexor digitorum longus | -innervation

Answer 52

tibial nerve (S2, S3)

Question 53

tibialis posterior | -origin

Answer 53

interosseus membrane posterior surface o tibia inferior to soleal line posterior surface of fibula

Question 54

tibialis posterior | -insertion

Answer 54

tuberosity of navicular all three cuneiform bones (and cuboid bone?) bases of 2nd, 3rd, 4th metatarsals

Question 55

tibialis posterior | -actions

Answer 55

``` plantarflexes foot inverts foot supports -transverse arch -medial longitudinal arch ```

Question 56

tibialis posterior | -innervation

Answer 56

tibial nerve (L4, L5)

Question 57

muscles that support medial longitudinal arch

Answer 57

``` tibialis anterior peroneus longus flexor hallucis longus flexor digitorum longus tibialis posterior ```

Question 58

muscles that support lateral longitudinal arch

Answer 58

peroneus longus | flexor hallucis longus?

Question 59

muscles that support transverse longitudinal arch

Answer 59

peroneus longus | tibialis posterior