2. Leg Muscles

Question 1

tibialis anterior origin + insertion

Answer 1

or
- lateral surface of tibia and interosseous membrane

in

• inferior medial cuneiform
• inferior base of 1st metatarsal

Question 2

tibialis anterior action

Answer 2

dorsiflexion and inversion

Question 3

tibialis anterior innervation

Answer 3

deep fibular nerve

- (branch of sciatic nerve)

Question 4

extensor digitorum longus origin + insertion

Answer 4

or

• lateral tibial condyle
• proximal 1/2 of fibula

in
- dorsal side of middle and distal phalanges of toes 2-5

Question 5

extensor digitorum longus action

Answer 5

extends toes 2-5

- some ankle dorsiflexion

Question 6

extensor digitorum longus innervation

Answer 6

deep fibular nerve

Question 7

fibularis tertius origin + insertion

Answer 7

or
- distal medial fibula

in
- dorsal side of base of metatarsal 5

Question 8

fibularis tertius action

Answer 8

eversion (big toe down)

- some dorsiflexion

Question 9

extensor hallucis longus origin + insertion

Answer 9

or

• middle 1/2 of fibula
• interosseous membrane

in
- dorsal side of distal phalanx of digit 1 (big toe)

Question 10

extensor hallucis longus action

Answer 10

extends big toe

- some dorsiflexion

Question 11

extensor hallucis longus innervation

Answer 11

deep fibular nerve

Question 12

fibularis tertius innervation

Answer 12

deep fibular nerve

Question 13

what holds tendons of anterior leg muscles in place

Answer 13

extensor retinaculum

superior - horizontal
inferior - V shape

Question 14

fibularis longus origin and insertion

Answer 14

or
- head of fibula and upper lateral fibula

in
- plantar sides of medial cuneiform and base of metatarsal 1

Question 15

fibularis longus action

Answer 15

ankle eversion

some plantar flexion

Question 16

fibularis longus innervation

Answer 16

superficial fibular nerve

Question 17

fibularis brevis origin + insertion

Answer 17

or
- lower 2/3 of lateral fibular rve

in
- lateral tubercle at base of metatarsal 5

Question 18

fibularis brevis action

Answer 18

ankle eversion (strong)
some plantar flexion

Question 19

fibularis brevis innervation

Answer 19

superficial fibular nerve

Question 20

anterior leg muscles

Answer 20

tibialis anterior
extensor digitorum longus
fibularis tertius
extensor hallicus longus

Question 21

lateral leg muscles

Answer 21

fibularis longus

fibularis brevis

Question 22

superficial posterior leg muscles

Answer 22

superficial

• medial gastrocnemius
• lateral gastrocnemius
• soleus
• plantaris
• popliteus

Question 23

why is gastrocnemius so defined

Answer 23

muscle shortens, tendon lengthens which allows it to shorten more

Question 24

muscles that insert into the achillies tendons

Answer 24

gastrocnemius
soleus
plantaris (via long tendon)

Question 25

Gastrocnemius origin

Answer 25

medial - posterior distal femur (just above medial condyle) lateral - lateral femoral condyle * crosses knee joint

Question 26

Gastrocnemius insertion

Answer 26

via achillies tendon to posterior calcaneus

Question 27

Gastrocnemius action

Answer 27

plantar flexion ankle | knee flexion

Question 28

gastrocnemius innervation

Answer 28

tibial nerve

Question 29

soleus origin

Answer 29

soleal line and medial tibia; posterior head; neck and proximal shaft of fibula

Question 30

soleus insertion

Answer 30

via achilles tendon to posterior calcaneous

Question 31

soleus action

Answer 31

ankle plantarflexion

Question 32

soleus innervation

Answer 32

tibial nerve

Question 33

plantaris origin and insertion

Answer 33

or - lateral supracondylar line of femur and knee joint capsule in - via long tendon that inserts into achilles tendon, to posterior calcaneus

Question 34

plantaris action

Answer 34

knee flexion and ankle plantar flexion | - negligible

Question 35

plantaris innervation

Answer 35

tibial nerve

Question 36

deep posterior leg muscles

Answer 36

tibialis posterior flexor digitorum longus flexor hallucis longus

Question 37

tibialis posterior origin and insertion

Answer 37

or - upper posterior interosseous membrane, lateral tibia and medial fibula in - plantar side of navicular and medial cuneiform

Question 38

tibialis posterior action

Answer 38

ankle plantar flexion | inversion

Question 39

tibialis posterior innervation

Answer 39

tibial nerve

Question 40

flexor digitorum longus origin + insertion

Answer 40

or - medial 1/2 of posterior tibia in - plantar side of distal phalanges of toes 2-5

Question 41

flexor digitorum longus action

Answer 41

flexor of toes 2-5

Question 42

flexor digitorum longus innervation

Answer 42

tibial nerve

Question 43

flexor hallucis longus origin + insertion

Answer 43

or. - posterior mid-fibula and interosseous membrane in. - plantar side of distal phalanx of toe 1

Question 44

flexor hallucis longus action

Answer 44

flexion of toe 1