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Flashcards in Leg Muscles Deck (55):
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Muscles of anterior compartment of leg

Tibialis anterior
Extensor hallucinations longus
Extensor digitorum longus
Fibularis tertius

1

Muscles of lateral compartment of leg

Fibularis longus and brevis

2

Tibialis anterior origin

Lateral condyle and superior 2/3 of lateral surface of tibia and interosseus membrane

3

Tibialis anterior insertion

Medial and inferior surfaces of medial cuneiform and base of 1st metatarsal

4

Tibialis anterior innervation

Deep fibular nerve
L4, L5

5

Tibialis anterior action

Dorsiflexed ankle
Inverts foot
Supports medial longitudinal arch of foot

6

Extensor hallucis longus origin

Middle part of anterior surface of fibula and interosseus membrane

7

Extensor hallucis longus insertion

Dorsal aspect of base of distal phalanx of great toe

8

Extensor hallucis longus innervation

Deep fibular nerve
L5, s1

9

Extensor hallucis longus action

Extends great toe
Dorsiflexes ankle

10

Extensor digitorum longus origin

Lateral condyle of tibia and superior 2/3 of anterior surface of fibula and interosseus membrane

11

Extensor digitorum longus insertion

Middle and distal phalanges of lateral four digits

12

Extensor digitorum longus innervation

Deep fibular nerve
L5, s1

13

Extensor digitorum longus action

Extends lateral four digits
Dorsiflexes ankle

14

Fibularis tertius origin

Inferior third of anterior surface of fibula and interosseus membrane

15

Fibularis tertius insertion

Dorsum of base of 5th metatarsal

16

Fibularis tertius innervation

Deep fibular nerve
L5, s1

17

Fibularis tertius action

Dorsiflexes ankle, aids in eversion of foot

18

Fibularis longus origin

Head and superior two thirds of lateral surface of fibula

19

Fibularis longus insertion

Base of 1st metatarsal and medial cuneiform

20

Fibularis longus innervation

Superficial fibular never
L5, s1, s2

21

Fibularis longus action

Evert foot
Weakly plantar flex ankle
Supports transverse arch of foot

22

Fibularis brevis origin

Middle part of lateral surface of fibula

23

Fibularis brevis insertion

Dorsal surface of tuberosity of base of 5th metatarsal

24

Fibularis brevis action

Evert foot
Weakly plantar flex ankle

25

Gastrocnemius origin

Lateral head: lateral aspect of lateral condyle of femur
Medial head: popliteal surface of femur, superior to medial condyle

26

Gastrocnemius insertion

Posterior surface of calcaneus via calcaneal tendon

27

Gastrocnemius innervation

Tibial nerve s1, s2

28

Gastrocnemius action

Plantar flexes ankle when knee is extended
Raises heel during walking
Flexes knee joint

29

Soleus origin

Posterior aspect of head of fibula
Superior quarter of posterior surface of fibula
Soleal line
Medial border of tibia

30

Soleus insertion

Posterior surface of calcaneus via calcaneal tendon

31

Soleus innervation

Tibial nerve s1, s2

32

Soleus action

Plantar flexes ankle, steadies leg on foot

33

Superficial muscle group

Gastrocnemius, Soleus, plantaris

34

Plantaris origin

Inferior end of lateral supracondylar line of femur and oblique popliteal ligament

35

Plantaris insertion

Posterior surface of calcaneus via calcaneal tendon

36

Plantaris innervation

Tibial nerve s1, s2

37

Plantaris action

Weakly assists gastrocnemius in plantar flexing ankle
Function is probably mainly proprioceptors

38

Deep muscles of posterior compartment of leg

Popliteus
Flexor hallucis longus
Flexor digitorum longus
Tibialis posterior

39

Popliteus origin

Lateral surface of lateral condyle of femur and lateral meniscus (intra-articular, within cavity of knee joint)

40

Popliteus insertion

Posterior surface of tibia, superior to soleal line

41

Popliteus innervation

Tibial nerve l4, l5, s1

42

Popliteus action

Weakly flexes knee and unlocks it by laterally rotating femur on fixed tibia
May also medially rotate tibia of unplanted limb

43

Flexor hallucis longus origin

Inferior two thirds of posterior surface of fibula and inferior part of interosseus membrane

44

Flexor hallucis longus insertion

Base of distal phalanx of great toe

45

Flexor hallucis longus innervation

Tibial nerve s2, s3

46

Flexor hallucis longus action

Flexes great toe at all joints, weakly plantar flexes ankle, supports medial longitudinal arches of foot

47

Flexor digitorum longus origin

Medial part of posterior surface of tibia inferior to soleal line and by a broad tendon to fibula

48

Flexor digitorum longus insertion

Bases of distal phalanges of lateral four digits

49

Flexor digitorum longus innervation

Tibial nerve s2, s3

50

Flexor digitorum longus action

Flexes lateral four digits, plantar flexes ankle, supports longitudinal arches of foot

51

Tibialis posterior origin

Interosseus membrane, posterior surface of tibia inferior to soleal line and posterior surface of fibula

52

Tibialis posterior insertion

Primarily to tuberosity of navicular
Also to cuneiforms, cuboid, and bases of 2nd to 4th metatarsals

53

Tibialis posterior innervation

Tibial nerve l4, l5

54

Tibialis posterior action

Plantar flexes ankle, inverts foot, supports media, longitudinal arch of foot