2. Leg Muscles Flashcards Preview

Anatomy 3402 - 2nd Half > 2. Leg Muscles > Flashcards

Flashcards in 2. Leg Muscles Deck (44):
1

tibialis anterior origin + insertion

or
- lateral surface of tibia and interosseous membrane

in
- inferior medial cuneiform
- inferior base of 1st metatarsal

2

tibialis anterior action

dorsiflexion and inversion

3

tibialis anterior innervation

deep fibular nerve
- (branch of sciatic nerve)

4

extensor digitorum longus origin + insertion

or
- lateral tibial condyle
- proximal 1/2 of fibula

in
- dorsal side of middle and distal phalanges of toes 2-5

5

extensor digitorum longus action

extends toes 2-5
- some ankle dorsiflexion

6

extensor digitorum longus innervation

deep fibular nerve

7

fibularis tertius origin + insertion

or
- distal medial fibula

in
- dorsal side of base of metatarsal 5

8

fibularis tertius action

eversion (big toe down)
- some dorsiflexion

9

extensor hallucis longus origin + insertion

or
- middle 1/2 of fibula
- interosseous membrane

in
- dorsal side of distal phalanx of digit 1 (big toe)

10

extensor hallucis longus action

extends big toe
- some dorsiflexion

11

extensor hallucis longus innervation

deep fibular nerve

12

fibularis tertius innervation

deep fibular nerve

13

what holds tendons of anterior leg muscles in place

extensor retinaculum

superior - horizontal
inferior - V shape

14

fibularis longus origin and insertion

or
- head of fibula and upper lateral fibula

in
- plantar sides of medial cuneiform and base of metatarsal 1

15

fibularis longus action

ankle eversion
some plantar flexion

16

fibularis longus innervation

superficial fibular nerve

17

fibularis brevis origin + insertion

or
- lower 2/3 of lateral fibular rve

in
- lateral tubercle at base of metatarsal 5

18

fibularis brevis action

ankle eversion (strong)
some plantar flexion

19

fibularis brevis innervation

superficial fibular nerve

20

anterior leg muscles

tibialis anterior
extensor digitorum longus
fibularis tertius
extensor hallicus longus

21

lateral leg muscles

fibularis longus
fibularis brevis

22

superficial posterior leg muscles

superficial
- medial gastrocnemius
- lateral gastrocnemius
- soleus

- plantaris
- popliteus

23

why is gastrocnemius so defined

muscle shortens, tendon lengthens which allows it to shorten more

24

muscles that insert into the achillies tendons

gastrocnemius
soleus
plantaris (via long tendon)

25

Gastrocnemius origin

medial
- posterior distal femur (just above medial condyle)
lateral
- lateral femoral condyle

* crosses knee joint

26

Gastrocnemius insertion

via achillies tendon to posterior calcaneus

27

Gastrocnemius action

plantar flexion ankle
knee flexion

28

gastrocnemius innervation

tibial nerve

29

soleus origin

soleal line and medial tibia; posterior head; neck and proximal shaft of fibula

30

soleus insertion

via achilles tendon to posterior calcaneous

31

soleus action

ankle plantarflexion

32

soleus innervation

tibial nerve

33

plantaris origin and insertion

or
- lateral supracondylar line of femur and knee joint capsule

in
- via long tendon that inserts into achilles tendon, to posterior calcaneus

34

plantaris action

knee flexion and ankle plantar flexion
- negligible

35

plantaris innervation

tibial nerve

36

deep posterior leg muscles

tibialis posterior
flexor digitorum longus
flexor hallucis longus

37

tibialis posterior origin and insertion

or
- upper posterior interosseous membrane, lateral tibia and medial fibula

in
- plantar side of navicular and medial cuneiform

38

tibialis posterior action

ankle plantar flexion
inversion

39

tibialis posterior innervation

tibial nerve

40

flexor digitorum longus origin + insertion

or
- medial 1/2 of posterior tibia

in
- plantar side of distal phalanges of toes 2-5

41

flexor digitorum longus action

flexor of toes 2-5

42

flexor digitorum longus innervation

tibial nerve

43

flexor hallucis longus origin + insertion

or.
- posterior mid-fibula and interosseous membrane

in.
- plantar side of distal phalanx of toe 1

44

flexor hallucis longus action

flexion of toe 1