Lower Leg/Ankle Myology

Question 1

muscles in anterior compartment

Answer 1

tibialis anterior, extensor hallucis longus, extensor digitorum longus, extensor digitorum brevis, peroneus tertius

Question 2

nerve to anterior compartment

Answer 2

deep peroneal nerve

Question 3

tibialis anterior origin

Answer 3

lateral condyle, proximal 1/2 of lateral surface of tibia

Question 4

tibialis anterior insertion

Answer 4

medial and planter surface of medial cuneiform and of base of 1st MT

Question 5

tibialis anterior action

Answer 5

dorsiflexes and inverts ankle

Question 6

extensor hallucis longus origin

Answer 6

middle 2 quarters of anterior surface of fibula

Question 7

extensor hallucis longus insertion

Answer 7

base of distal phalanx of great toe

Question 8

extensor hallucis longus action

Answer 8

extends the MTP and IP joints of great toe

Question 9

extensor digitorum longus origin

Answer 9

lateral condyle of tibia, proximal 3/4 of anterior surface of body of fibula, interosseus membrane

Question 10

extensor digitorum longus insertion

Answer 10

4 tendons to digits 2-5 attached to base of middle and distal phalanges

Question 11

extensor digitorum longus action

Answer 11

extends MTP joints, assists extending IP joints of digits 2-5, dorsiflexes the ankle

Question 12

extensor digitorum brevis origin

Answer 12

superolateral surface of calcaneus

Question 13

extensor digitorum brevis insertion

Answer 13

4 tendons into proximal phalanx of great toe and long extensor tendons of 2, 3, and 4 digits

Question 14

extensor digitorum brevis action

Answer 14

toe extension

Question 15

peroneus tertius origin

Answer 15

distal 1/3 of anterior surface of fibula

Question 16

peroneus tertius insertion

Answer 16

dorsal surface, base of 5th MT

Question 17

peroneus tertius action

Answer 17

elevates the base of 5th MT, dorsiflexes, everts foot

Question 18

muscles in superficial posterior compartment

Answer 18

gastrocnemius, soleus, plantaris

Question 19

insertion for superficial posterior compartment

Answer 19

achilles tendon (posterior calcaneus)

Question 20

nerve for superficial posterior compartment

Answer 20

tibial nerve

Question 21

gastrocnemius origin

Answer 21

posterior parts of medial and lateral femoral condyles

Question 22

gastrocnemius action

Answer 22

primary ankle plantarflexor, secondary knee flexor

Question 23

soleus origin

Answer 23

posterior surfaces of head of fibula and soleal line

Question 24

soleus action

Answer 24

plantarflexes ankle

Question 25

plantaris origin

Answer 25

distal end of lateral supracondylar line

Question 26

plantaris action

Answer 26

works with gastrocnemius to plantarflex, assists with knee flexion

Question 27

muscles in deep posterior compartment

Answer 27

tibialis posterior, popliteus, flexor digitorum longus, flexor hallucis longus

Question 28

nerve to muscles in deep posterior compartment

Answer 28

tibial nerve

Question 29

tibialis posterior origin

Answer 29

most of interosseus membrane, lateral portion of posterior surface of tibia, proximal 2/3 of medial surface of fibula

Question 30

tibialis posterior insertion

Answer 30

navicular tuberosity, cuneiforms, cuboid, bases of the 2-4 MT

Question 31

tibialis posterior action

Answer 31

plantarflexes, inverts ankle

Question 32

popliteus origin

Answer 32

anterior lateral surface of the condyle of the femur

Question 33

popliteus insertion

Answer 33

posterior surface of tibia near soleal line

Question 34

popliteus action

Answer 34

internal rotation of knee joint, unlocks extended knee, weak knee flexor

Question 35

flexor digitorum longus origin

Answer 35

middle 3/5 of posterior surface of body of tibia

Question 36

flexor digitorum longus insertion

Answer 36

bases of distal phalanges of digits 2-5

Question 37

flexor digitorum longus action

Answer 37

flexes proximal and distal IP and MTP joints of digits 2-5, assists with plantarflexion

Question 38

flexor hallucis longus origin

Answer 38

posterior surface of distal 2/3 of fibula and interosseus membrane

Question 39

flexor hallucis longus insertion

Answer 39

base of distal phalanx of great toe (plantar surface)

Question 40

flexor hallucis longus action

Answer 40

flexes the great toe

Question 41

muscles in lateral compartment

Answer 41

peroneus longus, peroneus brevis

Question 42

lateral compartment nerve

Answer 42

superficial peroneal

Question 43

peroneus longus origin

Answer 43

head and proximal 2/3 of lateral surface of fibula

Question 44

peroneus longus insertion

Answer 44

lateral side of base of 1st MT and medial cuneiform

Question 45

peroneus longus action

Answer 45

everts foot, assists in plantarflexion, depresses 1st MT

Question 46

peroneus brevis origin

Answer 46

distal 2/3 of the lateral surface of fibula

Question 47

peroneus brevis insertion

Answer 47

tuberosity of the 5th MT

Question 48

peroneus brevis action

Answer 48

everts foot, assists in plantarflexion