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Med School Yr 2 > Muscles in the Leg > Flashcards

Muscles in the Leg Flashcards

1
Q

how many muscles are in the anterior compartment of the leg?

A

4 muscles

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2
Q

what are the 4 muscles in the anterior compartment of the leg?

A
  • tibialis anterior
  • extensor digitorum longus
  • extensor hallucis longus
  • fibularis tertius
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3
Q

what are the origins and insertions of the extensor digitorum longus?

A
  • origins - lateral condyle of tibia and medial surface of fibula
  • inserts - tendon splits into 4 and inserts onto toes
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4
Q

what is the action of the extensor digitorum longus?

A

extension of the 4 toes and dorsiflexion of the foot

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5
Q

what is the strongest dorsiflexor of the foot?

A

tibialis anterior

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6
Q

what are the origins and insertions of the tibialis anterior?

A
  • origins - lateral surface of tibia
  • inserts - medial cuneiform and base of metatarsal I
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7
Q

what is the action of the tibialis anterior?

A

dorsiflexion and inversion of the foot

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8
Q

what are the origins and insertions of the extensor hallucis longus?

A
  • origins - medial surface of fibular shaft
  • inserts - base of distal phalanx of the great toe
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9
Q

what is the action of the extensor hallucis longus?

A

extension of great toe and dorsiflexion of the foot

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10
Q

all muscles in the anterior compartment of the leg are innervated by what?

A

deep fibular nerve (L4-S1)

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11
Q

all muscles in the anterior compartment of the leg receive their arterial supply from?

A

anterior tibial artery

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12
Q
A
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13
Q

what are the origins and insertions of the fibularis tertius?

A
  • origins - extensor digitorum longus
  • inserts - 5th metatarsal
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14
Q

what are the actions of the fibularis tertius?

A

eversion and dorsiflexion of the foot

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15
Q

what is ‘foot drop’?

A
  • inability to dorsiflex foot at ankle
  • usually due to damaged common fibular nerve
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16
Q

label the muscles of the anterior leg

A
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17
Q

label this muscle

A
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18
Q

what muscles are in the lateral compartment of the leg?

A

fibularis longus
fibularis brevis

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19
Q

the muscles of the lateral compartment of the leg are innervated by what?

A

superficial fibular nerve

20
Q

what are the origins and insertions of the fibularis longus?

A
  • origins - superior + lateral fibular and lateral tibial condyle
  • inserts - attaches to the medial bones (cuneiform + base of metatarsal I)
21
Q

what are the actions of the fibularis longus?

A
  • eversion + plantar flexion of foot
  • supports lateral + transverse arches
22
Q

what are the origins and insertions of teh fibularis brevis?

A
  • origins - inferolateral fibular shaft
  • insertions - tubercle on 5th metatarsal
23
Q

what are the actions of the fibularis brevis?

A

everts the foot

24
Q

label the muscles of the lateral compartment of the leg?

A
25
Q

the muscles in the posterior compartment of the leg are all innervated by what nerve?

A

tibial nerve

26
Q

the muscles of the posterior compartment of the leg can be divided into what?

A

superficial and deep

27
Q

what muscles are in the superficial posterior compartment of the leg?

A
  • gastrocnemius
  • plantaris
  • soleus
28
Q

what are the origins and insertions of the gastrocnemius?

A
  • origin - lateral +medial femoral condyle
  • inserts - converges with soleus to form calcaneal tendon that attaches to calcaneus
29
Q

what are the actions of the gastrocnemius?

A

plantar flexion at ankle and flexion at knee joint

30
Q

what are the origins and insertions of the plantaris?

A
  • origins - lateral suprcondylar line of femur
  • inserts - blends with calcaneal tendon and inserts on calcaneus
31
Q

what are the actions of the plantaris?

A

plantar flexion at ankle joint + flexion at knee

32
Q

what are the origins and insertions of the soleus?

A
  • origin - soleal line of tibia + proximal fibula
  • inserts - converges with gastrocnemius to form calcenal tendon and attaches to calcaneus
33
Q

what are the actions of the soleus?

A

plantar flexion of foot at ankle joint

34
Q

blood supply to the posterior compartment of the leg is mainly by what?

A

posterior tibial artery

35
Q

what are the 4 muscles in the deep posterior compartment of the leg?

A
  • popliteus
  • tibialis posterior
  • flexor digitorum longus
  • flexor hallucis longus
36
Q

what are the origins and insertions of the flexor digitorum longus?

A
  • origins - medial surface of tibia
  • inserts - plantar surfaces of lateral 4 digits
37
Q

what are the actions of the flexor digitorum longus?

A

flexion of 4 lateral toes

38
Q

what are the origins and insertions of the popliteus?

A
  • origin - lateral condyle of femur and lateral meniscus of knee joint
  • inserts - proximal tibia
39
Q

what are the actions of the popliteus?

A

laterally rotates femus relative to tibia

40
Q

whata re the origins and insertions of the tibilais posterior?

A
  • origin - posterior surface of tibia and fibula
  • inserts - plantar surface of medial tarsal bones
41
Q

what are the actions of the tibialis posterior?

A
  • inversion and plantar flexion of foot
  • contributes to medial arch
42
Q

what are the origins and insertions of the flexor hallucis longus?

A
  • origin - posterior fibula
  • inserts - plantar surface of phalanx of great toe
43
Q

what are the actions of the flexor hallucis longus?

A

flexes big toe

44
Q

label the deep muscles of the posterior compartment of the leg

A
45
Q

label the superficial muscles of the posterior compartment of the leg

A

Med School Yr 2 (96 decks)

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