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

2. Leg Muscles Flashcards

1
Q

tibialis anterior origin + insertion

A

or
- lateral surface of tibia and interosseous membrane

in

  • inferior medial cuneiform
  • inferior base of 1st metatarsal
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2
Q

tibialis anterior action

A

dorsiflexion and inversion

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3
Q

tibialis anterior innervation

A

deep fibular nerve

- (branch of sciatic nerve)

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4
Q

extensor digitorum longus origin + insertion

A

or

  • lateral tibial condyle
  • proximal 1/2 of fibula

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

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5
Q

extensor digitorum longus action

A

extends toes 2-5

- some ankle dorsiflexion

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6
Q

extensor digitorum longus innervation

A

deep fibular nerve

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7
Q

fibularis tertius origin + insertion

A

or
- distal medial fibula

in
- dorsal side of base of metatarsal 5

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8
Q

fibularis tertius action

A

eversion (big toe down)

- some dorsiflexion

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9
Q

extensor hallucis longus origin + insertion

A

or

  • middle 1/2 of fibula
  • interosseous membrane

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

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10
Q

extensor hallucis longus action

A

extends big toe

- some dorsiflexion

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11
Q

extensor hallucis longus innervation

A

deep fibular nerve

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12
Q

fibularis tertius innervation

A

deep fibular nerve

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13
Q

what holds tendons of anterior leg muscles in place

A

extensor retinaculum

superior - horizontal
inferior - V shape

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14
Q

fibularis longus origin and insertion

A

or
- head of fibula and upper lateral fibula

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

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15
Q

fibularis longus action

A

ankle eversion

some plantar flexion

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16
Q

fibularis longus innervation

A

superficial fibular nerve

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17
Q

fibularis brevis origin + insertion

A

or
- lower 2/3 of lateral fibular rve

in
- lateral tubercle at base of metatarsal 5

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18
Q

fibularis brevis action

A 
ankle eversion (strong)
some plantar flexion
19
Q

fibularis brevis innervation

A

superficial fibular nerve

20
Q

anterior leg muscles

A

tibialis anterior
extensor digitorum longus
fibularis tertius
extensor hallicus longus

21
Q

lateral leg muscles

A

fibularis longus

fibularis brevis

22
Q

superficial posterior leg muscles

A

superficial

  • medial gastrocnemius
  • lateral gastrocnemius
  • soleus
  • plantaris
  • popliteus
23
Q

why is gastrocnemius so defined

A

muscle shortens, tendon lengthens which allows it to shorten more

24
Q

muscles that insert into the achillies tendons

A

gastrocnemius
soleus
plantaris (via long tendon)

25
Q

Gastrocnemius origin

A

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

  • crosses knee joint
26
Q

Gastrocnemius insertion

A

via achillies tendon to posterior calcaneus

27
Q

Gastrocnemius action

A

plantar flexion ankle

knee flexion

28
Q

gastrocnemius innervation

A

tibial nerve

29
Q

soleus origin

A

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

30
Q

soleus insertion

A

via achilles tendon to posterior calcaneous

31
Q

soleus action

A

ankle plantarflexion

32
Q

soleus innervation

A

tibial nerve

33
Q

plantaris origin and insertion

A

or
- lateral supracondylar line of femur and knee joint capsule

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

34
Q

plantaris action

A

knee flexion and ankle plantar flexion

- negligible

35
Q

plantaris innervation

A

tibial nerve

36
Q

deep posterior leg muscles

A

tibialis posterior
flexor digitorum longus
flexor hallucis longus

37
Q

tibialis posterior origin and insertion

A

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

in
- plantar side of navicular and medial cuneiform

38
Q

tibialis posterior action

A

ankle plantar flexion

inversion

39
Q

tibialis posterior innervation

A

tibial nerve

40
Q

flexor digitorum longus origin + insertion

A

or
- medial 1/2 of posterior tibia

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

41
Q

flexor digitorum longus action

A

flexor of toes 2-5

42
Q

flexor digitorum longus innervation

A

tibial nerve

43
Q

flexor hallucis longus origin + insertion

A

or.
- posterior mid-fibula and interosseous membrane

in.
- plantar side of distal phalanx of toe 1

44
Q

flexor hallucis longus action

A

flexion of toe 1

Anatomy 3402 - 2nd Half (11 decks)

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