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Anatomy > Leg Muscles > Flashcards

Leg Muscles Flashcards

1
Q

Tibialis anterior origin

A

Upper 2/3 of lateral surface of the tibia, interosseous membrane, and superficial crural fascia of leg

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2
Q

Tibialis anterior insertion

A

Medial cuneiform (medial/plantar surface) and base of 1st metatarsal (the tendon passes deep to the extensor retinacula)

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3
Q

Tibialis anterior action

A

Dorsiflexes and inverts the foot; assists in holding up the medial longitudinal arch of the foot

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4
Q

Tibialis anterior innervation and spinal level

A

Deep fibular L4-5

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5
Q

Extensor Digitorum longus origin

A

Lateral tibial condole, proximal anterior surface of fibula, interosseous membrane, and deep fascia

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6
Q

Extensor digitorum longus action

A

Extend toes 2-5 at MTP & IP joints ; assist dorsiflexion and Eversion of foot

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7
Q

Extensor digitorum longus innervation and spinal level

A

Deep fibular L5-S1

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8
Q

Fibularis Tertius origin

A

Distal anterior surface of fibula

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9
Q

Fibularis tertius insertion

A

Dorsal surface of base of 5th metatarsal

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10
Q

Fibularis tertius action

A

Everts & dorsiflexes the foot

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11
Q

Fibularis tertius innervation and spinal level

A

Deep fibular L5-S1

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12
Q

Extensor hallucis longus origin

A

Middle 1/3 of the anterior surface of the fibula & interosseous membrane

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13
Q

Extensor hallucis longus insertion

A

Base of distal phalanx of the great toe

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14
Q

Extensor hallicus longus action

A

Dorsiflexes (extends) the great toe at MTP and IP joints; assists dorsiflexion and inversion of foot from neutral (can evert from inverted position)

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15
Q

Extensor hallicus longus innervation and spinal level

A

Deep fibular L5

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16
Q

Fibularis longus origin

A

Superior 1/2 of the lateral surface of the fibula and adjacent fascia

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17
Q

Fibularis longus insertion

A

Plantar surface of the 1st (medial) cuneiform and 1st metatarsal

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18
Q

Fibularis longus action

A

Eversion of the foot; assists plantarflexion and helps maintain the twisted configuration of the “forefoot”; support transverse arch

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19
Q

Fibularis longus innervation and spinal level

A

Superficial fibular L5-S1

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20
Q

Fibularis Brevis origin

A

Lower 1/2 of the lateral surface of the fibula and adjacent fascia

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21
Q

Fibularis brevis insertion

A

Lateral side of the base of the 5th metatarsal (“fibular tubercle”)

22
Q

Fibularis brevis action

A

Eversion of the foot; assist plantarflexion

23
Q

Fibularis brevis innervation and spinal level

A

Superficial fibular L5-S1

24
Q

Gastrocnemius origin

A

Medial head: medial femoral condyle

Lateral head: lateral femoral condyle

25
Q

Gastrocnemius insertion

A

Calcaneal tuberosity (posterior surface of calcaneous)

26
Q

Gastrocnemius action

A

Plantarflexion Foot
Flexes at knee in open chain
Extends at knee in closed chain

27
Q

Gastrocnemius innervation and spinal level

A

Tibial S1-2

28
Q

Soleus origin

A

Soleal line and middle 1/3 of medial border of tibia and upper 1/3 of posterior surface of fibula

29
Q

Soleus insertion

A

Calcaneal tuberosity

30
Q

Soleus action

A

Plantarflex foot; by preventing dorsiflexion at ankle it helps prevent flexion at the knee( could extend knee in closed chain)

31
Q

Soleus innervation and spinal level

A

Tibial S1-2

32
Q

Popliteus origin

A

Lateral epicondyle and condyle of femur (via joint capsule of the knee), posterior horn of the lateral meniscus

33
Q

Popliteus insertion

A

Upper/posterior tibia above the soleal line

34
Q

Popliteus action

A

Internal rotation of tibia; assist knee flexion

35
Q

Popliteus innervation and spinal level

A

Tibial L4-S1

36
Q

Plantaris origin

A

Lateral epicondyle of the femur (posterior surface)

37
Q

Plantaris insertion

A

Calcaneal tuberosity

38
Q

Plantaris action

A

Plantarfkex foot, more used in proprioception

39
Q

Plantaris innervation and spinal level

A

Tibial S1-2

40
Q

Flexor hallicus longus origin

A

Lower 2/3 of posterior surface of fibula ; and interosseous membrane

41
Q

Flexor hallicus longus insertion

A

Base of distal phalanx of the great toe

42
Q

Flexor hallicus longus action

A

Flex great toe at MTP and IP; assist plantarflexion of foot; support medial longitudinal arch; inversion

43
Q

Flexor hallicus longus innervation and spinal level

A

Tibial L5-S2

44
Q

Flexor digitorum longus origin

A

Middle 1/3 of the posterior surface of the tibia

45
Q

Flexor digitorum longus insertion

A

Plantar surface of the base of distal phalanges 2-5

46
Q

Flexor digitorum longus action

A

Flex toes 2-5 at MTP and IP joints; assist foot plantarflexion; inversion

47
Q

Flexor digitorum longus innervation and spinal level

A

Tibial L5-S2

48
Q

Tibialis posterior origin

A

Upper aspect of the posterolateral surface of tibia, fibula, and interosseous membrane

49
Q

Tibialis posterior insertion

A

navicular tuberosity ( & maybe spring ligament); cuneiform; sends slips of tendon to plantar surfaces of other tarsals and bases of metatarsals 2-4

50
Q

Tibialis posterior action

A

Inverts and adduct (medially rotates) the foot; assist plantarflexion; support longitudinal and transverse arches

51
Q

Tibialis posterior innervation and spinal level

A

Tibial L4-5

Anatomy (8 decks)

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