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MSS - MSK Exam 3 > Musculature of the Leg and Dorsum of the Foot > Flashcards

Musculature of the Leg and Dorsum of the Foot Flashcards

1
Q

muscles of anterior crural compartment and dorsum of the foot?

A

tibialis anterior
extensor digitorum longus
flbularis tertius
extensor hallucis longus

extensor digitorum brevis (only muscle on dorsum)

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2
Q

lateral crural ligaments?

A

fibularis longus

fibularis brevis

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3
Q

attachments of tibialis anterior?

A

origin:
lateral surface of most of tibia and interosseous membrane

insertion:
medial cuneiform and base of first metatarsal
to bottom of foot***

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4
Q

talus has how many articulating surfaces?

A

3

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5
Q

action of tibialis anterior?

A

dorsiflex and invert foot

POWERFUL INVERTER OF FOOT**

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6
Q

innervation of tibialis anterior?

A

deep fibular nerve

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7
Q

attachments of extensor digitorum longus?

A

origin:
most of anterior surface of fibula and interosseous membrane

insertion:
middle and distal phalanges of four lesser digits

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8
Q

action of extensor digitorum longus?

A

extends toes, dorsiflexes foot

**has fibular tertius

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9
Q

innervation of extensor digitorum longus?

A

deep fibular nerve

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10
Q

sustentaculum tali

A

on calcaneus

maintains talus superiorly

allows for arch

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11
Q

how many compartments in leg?

A

4

anterior and posterior intermuscular septa
transverse intermuscular septa

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12
Q

extensor retinaculum?

A

super and inferior

-over extensors of foot

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13
Q

lateral retinaculum?

A

fibular

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14
Q

medial retinaculum?

A

lateral side of foot

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15
Q

muscles of anterior crural compartment?

A

tibialis anterior
extensor digitorum longus
extensor hallucis longus
fibularis tertius

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16
Q

attachment of fibularis tertius

A

origin:
distal anterior surface of fibula (continuation of extensor digitorum longus)

insertion:
base of 5th metatarsal
-on top of foot***

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17
Q

action of fibularis tertius

A

aids in eversion and dorsiflexion

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18
Q

innervation of fibularis tertius?

A

deep fibular nerve

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19
Q

attachments of extensor hallucis longus?

A

origin:
mid-portion of fibula, deep to tibialis anterior and extensor digitorum

insertion:
base of distal phalanx of great toe (Hallux)

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20
Q

action of extensor hallucis longus?

A

extends great toe, dorsiflexes foot

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21
Q

innervation of extensor hallucis longus?

A

deep fibular nerve

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22
Q

attachment of extensor digitorum brevis?

A
  • *only muscle on dorsum of foot
  • has extensor hallucis brevis component - to digit 1

origin:
dorsal surface of calcaneus

insertion:
base of proximal phalanx of great toe and proximal phalanges of toes 2,3 and 4 which attach in concert with tendons of extensor digitorum longus

23
Q

action of extensor digitorum brevis?

A

extend toes 1,2,3,4

24
Q

innervation of extensor digitorum brevis?

A

deep fibular nerve

25
Q

muscles of lateral crural compartments

A

everters

flbularis longus
fibularis brevis

26
Q

attachment of fibularis longus?

A

origin:
upper lateral two thirds of fibula

insertion:
first metatarsal and medial cuneiform
-to bottom of foot

27
Q

action of fibularis longus?

A

everts and plantar flexes foot

to medial cuneiform**
-acts with antagonist tibialias anterior for eversion/inversion stability when walking

28
Q

innervation of fibularis longus?

A

superficial fibular nerve

29
Q

attachments of fibularis brevis

A

origin:
distal lateral fibula

insertion:
base of fifth metatarsal

30
Q

action of fibularis brevis

A

everts and plantar flexes the foot

31
Q

innervation of fibular brevis

A

superficial fibular nerve

32
Q

muscles of posterior crural compartment?

A

superficial layer:
gastrocnemius
soleus
plantaris

deep layer:
popliteus
flexor digitorum longus
flexor hallucis longus
tibialis posterior
33
Q

attachments of gastrocnemius

A

origin:
posterior surfaces of roughened area of lateral and medial femoral condyles

insertion:
calcaneus in common with soleus and plantaris muscles (achilles tendon)

34
Q

action of gastrocnemius

A

plantar flexes foot, flexes leg

more in running**

35
Q

innervation of gastrocnemius

A

tibial nerve

36
Q

triceps serae?

A

gastrocnemius
soleus
plantaris

37
Q

attachments of soleus

A

origin:
posterior surface of head and proximal shaft of fibula, soleal line on upper portion of tibia

insertion:
calcaneus with grastrocnemius and plantaris muscle

38
Q

action of soleus?

A

plantar flexes foot

more in jumping**
-bc its below the knee no leg flexion only plantar flexion

39
Q

innervation of soleus?

A

tibial nerve

40
Q

attachments of the plantaris?

A

origin:
posterior surface of lateral femoral condyle

insertion:
calcaneus with gastrocnemius and soleus

41
Q

action of plantaris?

A

weakly plantar flex foot and flex leg

42
Q

innervation of plantaris?

A

tibial nerve

43
Q

attachments of popliteus?

A

origin:
lateral surface of lateral condyle of femur

insertion:
proximal tibia above soleal line

44
Q

action of popliteus?

A

flexes and medially rotates leg

when foot is fixed, lateral rotates femur to unlock knee joint as leg flexion proceeds***

45
Q

innervation of popliteus?

A

tibial nerve

46
Q

achilles tendons

A

triceps serae

47
Q

attachments of flexor digitorum longus?

A

origin:
posterior surface, mid portion of tibia

insertion:
base of distal phalanx of four small toes

48
Q

action of flexor digitorum longus?

A

flexes four small toes, plantar flexes foot

49
Q

innervation of flexor digitorum longus?

A

tibial nerve

50
Q

attachments of tibialis posterior?

A

origin:
posterior surface of upper portion of tibia, fibula and intervening interosseous membrane

insertion:
plantar surface of metatarsals 2,3,4, navicular, medial cuneiform mainly, but also to ALL other tarsals except talus

51
Q

action of tibialis posterior?

A

inverts and plantar flexes foot

52
Q

innervation of tibialis posterior?

A

tibial nerve

53
Q

tendons behind medial malleolus?

A

anteromedial to posterolateral
Tom, Dick, and Harry

-in superior portion:
Dick, Tom and Harry

MSS - MSK Exam 3 (16 decks)

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