Musculature of the Leg and Dorsum of the Foot

Question 1

muscles of anterior crural compartment and dorsum of the foot?

Answer 1

tibialis anterior
extensor digitorum longus
flbularis tertius
extensor hallucis longus

extensor digitorum brevis (only muscle on dorsum)

Question 2

lateral crural ligaments?

Answer 2

fibularis longus

fibularis brevis

Question 3

attachments of tibialis anterior?

Answer 3

origin:
lateral surface of most of tibia and interosseous membrane

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

Question 4

talus has how many articulating surfaces?

Answer 4

3

Question 5

action of tibialis anterior?

Answer 5

dorsiflex and invert foot

POWERFUL INVERTER OF FOOT**

Question 6

innervation of tibialis anterior?

Answer 6

deep fibular nerve

Question 7

attachments of extensor digitorum longus?

Answer 7

origin:
most of anterior surface of fibula and interosseous membrane

insertion:
middle and distal phalanges of four lesser digits

Question 8

action of extensor digitorum longus?

Answer 8

extends toes, dorsiflexes foot

**has fibular tertius

Question 9

innervation of extensor digitorum longus?

Answer 9

deep fibular nerve

Question 10

sustentaculum tali

Answer 10

on calcaneus

maintains talus superiorly

allows for arch

Question 11

how many compartments in leg?

Answer 11

4

anterior and posterior intermuscular septa
transverse intermuscular septa

Question 12

extensor retinaculum?

Answer 12

super and inferior

-over extensors of foot

Question 13

lateral retinaculum?

Answer 13

fibular

Question 14

medial retinaculum?

Answer 14

lateral side of foot

Question 15

muscles of anterior crural compartment?

Answer 15

tibialis anterior
extensor digitorum longus
extensor hallucis longus
fibularis tertius

Question 16

attachment of fibularis tertius

Answer 16

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

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

Question 17

action of fibularis tertius

Answer 17

aids in eversion and dorsiflexion

Question 18

innervation of fibularis tertius?

Answer 18

deep fibular nerve

Question 19

attachments of extensor hallucis longus?

Answer 19

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

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

Question 20

action of extensor hallucis longus?

Answer 20

extends great toe, dorsiflexes foot

Question 21

innervation of extensor hallucis longus?

Answer 21

deep fibular nerve

Question 22

attachment of extensor digitorum brevis?

Answer 22

• *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

Question 23

action of extensor digitorum brevis?

Answer 23

extend toes 1,2,3,4

Question 24

innervation of extensor digitorum brevis?

Answer 24

deep fibular nerve

Question 25

muscles of lateral crural compartments

Answer 25

everters flbularis longus fibularis brevis

Question 26

attachment of fibularis longus?

Answer 26

origin: upper lateral two thirds of fibula insertion: first metatarsal and medial cuneiform -to bottom of foot

Question 27

action of fibularis longus?

Answer 27

everts and plantar flexes foot to medial cuneiform** -acts with antagonist tibialias anterior for eversion/inversion stability when walking

Question 28

innervation of fibularis longus?

Answer 28

superficial fibular nerve

Question 29

attachments of fibularis brevis

Answer 29

origin: distal lateral fibula insertion: base of fifth metatarsal

Question 30

action of fibularis brevis

Answer 30

everts and plantar flexes the foot

Question 31

innervation of fibular brevis

Answer 31

superficial fibular nerve

Question 32

muscles of posterior crural compartment?

Answer 32

superficial layer: gastrocnemius soleus plantaris ``` deep layer: popliteus flexor digitorum longus flexor hallucis longus tibialis posterior ```

Question 33

attachments of gastrocnemius

Answer 33

origin: posterior surfaces of roughened area of lateral and medial femoral condyles insertion: calcaneus in common with soleus and plantaris muscles (achilles tendon)

Question 34

action of gastrocnemius

Answer 34

plantar flexes foot, flexes leg more in running**

Question 35

innervation of gastrocnemius

Answer 35

tibial nerve

Question 36

triceps serae?

Answer 36

gastrocnemius soleus plantaris

Question 37

attachments of soleus

Answer 37

origin: posterior surface of head and proximal shaft of fibula, soleal line on upper portion of tibia insertion: calcaneus with grastrocnemius and plantaris muscle

Question 38

action of soleus?

Answer 38

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

Question 39

innervation of soleus?

Answer 39

tibial nerve

Question 40

attachments of the plantaris?

Answer 40

origin: posterior surface of lateral femoral condyle insertion: calcaneus with gastrocnemius and soleus

Question 41

action of plantaris?

Answer 41

weakly plantar flex foot and flex leg

Question 42

innervation of plantaris?

Answer 42

tibial nerve

Question 43

attachments of popliteus?

Answer 43

origin: lateral surface of lateral condyle of femur insertion: proximal tibia above soleal line

Question 44

action of popliteus?

Answer 44

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

Question 45

innervation of popliteus?

Answer 45

tibial nerve

Question 46

achilles tendons

Answer 46

triceps serae

Question 47

attachments of flexor digitorum longus?

Answer 47

origin: posterior surface, mid portion of tibia insertion: base of distal phalanx of four small toes

Question 48

action of flexor digitorum longus?

Answer 48

flexes four small toes, plantar flexes foot

Question 49

innervation of flexor digitorum longus?

Answer 49

tibial nerve

Question 50

attachments of tibialis posterior?

Answer 50

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

Question 51

action of tibialis posterior?

Answer 51

inverts and plantar flexes foot

Question 52

innervation of tibialis posterior?

Answer 52

tibial nerve

Question 53

tendons behind medial malleolus?

Answer 53

anteromedial to posterolateral Tom, Dick, and Harry -in superior portion: Dick, Tom and Harry