Musculature of the Leg and Dorsum of the Foot Flashcards Preview

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

Flashcards in Musculature of the Leg and Dorsum of the Foot Deck (53):
1

muscles of anterior crural compartment and dorsum of the foot?

tibialis anterior
extensor digitorum longus
flbularis tertius
extensor hallucis longus

extensor digitorum brevis (only muscle on dorsum)

2

lateral crural ligaments?

fibularis longus
fibularis brevis

3

attachments of tibialis anterior?

origin:
lateral surface of most of tibia and interosseous membrane

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

4

talus has how many articulating surfaces?

3

5

action of tibialis anterior?

dorsiflex and invert foot

POWERFUL INVERTER OF FOOT**

6

innervation of tibialis anterior?

deep fibular nerve

7

attachments of extensor digitorum longus?

origin:
most of anterior surface of fibula and interosseous membrane

insertion:
middle and distal phalanges of four lesser digits

8

action of extensor digitorum longus?

extends toes, dorsiflexes foot

**has fibular tertius

9

innervation of extensor digitorum longus?

deep fibular nerve

10

sustentaculum tali

on calcaneus

maintains talus superiorly

allows for arch

11

how many compartments in leg?

4

anterior and posterior intermuscular septa
transverse intermuscular septa

12

extensor retinaculum?

super and inferior
-over extensors of foot

13

lateral retinaculum?

fibular

14

medial retinaculum?

lateral side of foot

15

muscles of anterior crural compartment?

tibialis anterior
extensor digitorum longus
extensor hallucis longus
fibularis tertius

16

attachment of fibularis tertius

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

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

17

action of fibularis tertius

aids in eversion and dorsiflexion

18

innervation of fibularis tertius?

deep fibular nerve

19

attachments of extensor hallucis longus?

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

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

20

action of extensor hallucis longus?

extends great toe, dorsiflexes foot

21

innervation of extensor hallucis longus?

deep fibular nerve

22

attachment of extensor digitorum brevis?

**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

action of extensor digitorum brevis?

extend toes 1,2,3,4

24

innervation of extensor digitorum brevis?

deep fibular nerve

25

muscles of lateral crural compartments

everters

flbularis longus
fibularis brevis

26

attachment of fibularis longus?

origin:
upper lateral two thirds of fibula

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

27

action of fibularis longus?

everts and plantar flexes foot

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

28

innervation of fibularis longus?

superficial fibular nerve

29

attachments of fibularis brevis

origin:
distal lateral fibula

insertion:
base of fifth metatarsal

30

action of fibularis brevis

everts and plantar flexes the foot

31

innervation of fibular brevis

superficial fibular nerve

32

muscles of posterior crural compartment?

superficial layer:
gastrocnemius
soleus
plantaris

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

33

attachments of gastrocnemius

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

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

34

action of gastrocnemius

plantar flexes foot, flexes leg

more in running**

35

innervation of gastrocnemius

tibial nerve

36

triceps serae?

gastrocnemius
soleus
plantaris

37

attachments of soleus

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

action of soleus?

plantar flexes foot

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

39

innervation of soleus?

tibial nerve

40

attachments of the plantaris?

origin:
posterior surface of lateral femoral condyle

insertion:
calcaneus with gastrocnemius and soleus

41

action of plantaris?

weakly plantar flex foot and flex leg

42

innervation of plantaris?

tibial nerve

43

attachments of popliteus?

origin:
lateral surface of lateral condyle of femur

insertion:
proximal tibia above soleal line

44

action of popliteus?

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

45

innervation of popliteus?

tibial nerve

46

achilles tendons

triceps serae

47

attachments of flexor digitorum longus?

origin:
posterior surface, mid portion of tibia

insertion:
base of distal phalanx of four small toes

48

action of flexor digitorum longus?

flexes four small toes, plantar flexes foot

49

innervation of flexor digitorum longus?

tibial nerve

50

attachments of tibialis posterior?

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

action of tibialis posterior?

inverts and plantar flexes foot

52

innervation of tibialis posterior?

tibial nerve

53

tendons behind medial malleolus?

anteromedial to posterolateral
Tom, Dick, and Harry

-in superior portion:
Dick, Tom and Harry