Popliteal Fossa And Lower Leg Muscles

Question 1

Tibialis Anterior origin

Answer 1

Lateral condyle and superior 1/2 of lateral tibia

Question 2

Tibialis Anterior insertion

Answer 2

Medial and inferior surfaces of medial cuneiform and 1st metatarsal

Question 3

Tibialis anterior action

Answer 3

• dorsiflexes and inverts foot

- supports the medial longitudinal arch

Question 4

Tibialis anterior innervation

Answer 4

Deep fibular (peroneal) nerve (L4, L5)

Question 5

Extensor Hallucis longus origin

Answer 5

Middle part of anterior surface of fibula and interosseus membrane

Question 6

Extensor Hallucis longus insertion

Answer 6

Dorsal aspect of base of distal phalanx of hallux

Question 7

Extensor Hallucis longus action

Answer 7

Extends hallux and dorsiflexes foot

Question 8

Extensor hallucis longus innervation

Answer 8

Deep fibular (peroneal) nerve (L4, L5)

Question 9

Extensor digitorum longus origin

Answer 9

• lateral condyle of tibia
• superior 3/4 of anterior surface of fibula
• interosseus membrane

Question 10

Extensor digitorum longus insertion

Answer 10

Middle and distal phalanges of lateral 4 digits

Question 11

Extensor digitorum longus action

Answer 11

Extends lateral 4 digits and dorsiflexes foot

Question 12

Extensor digitorum longus innervation

Answer 12

Deep fibular (peroneal) nerve (L4, L5)

Question 13

Peroneus (fibular) tertius origin

Answer 13

Inferior 1/3 of anterior surface of fibula and interosseus membrane

Question 14

Peroneus (fibular) tertius insertion

Answer 14

Dorsum of base of 5th metatarsal

Question 15

Peroneus (fibular) tertius action

Answer 15

Dorsiflexes foot and aids in eversion

Question 16

Peroneus (fibular) tertius innervation

Answer 16

Deep fibular (peroneal) nerve (L4, L5)

Question 17

Peroneus (fibular) longus origin

Answer 17

Head and superior 2/3 of lateral surface of fibula

Question 18

Peroneus (fibular) longus insertion

Answer 18

Base of first metatarsal and medial cuneiform

Question 19

Peroneus (fibular) longus action

Answer 19

• everts foot and weakly plantarflexes

- tendon supports the transverse and both medial and lateral longitudinal arches

Question 20

Peroneus (fibular) longus innervation

Answer 20

Superficial fibular (peroneal nerve) (L5, S1, S2)

Question 21

Peroneus (fibular) brevis origin

Answer 21

Inferior 2/3 of lateral surface of fibula

Question 22

Peroneus (fibular) brevis insertion

Answer 22

Dorsal surface of tuberosity on lateral side of base of 5th metatarsal

Question 23

Peroneus (fibular) brevis action

Answer 23

Everts foot and weakly plantarflexes

Question 24

Peroneus (fibular) brevis innervation

Answer 24

Superficial fibular (peroneal) nerve (L5, S1, S2)

Question 25

Gastrocnemius lateral head origin

Answer 25

Lateral aspect of lateral condyle of femur

Question 26

Gastrocnemius medial head origin

Answer 26

Popliteal surface of femur, superior to medial condyle

Question 27

Gastrocnemius insertion

Answer 27

Posterior surface of calcaneus via tendo calcaneus

Question 28

Gastrocnemius actiion

Answer 28

- plantar flexes foot - raises heel during walking - flexes knee joint

Question 29

Gastrocnemius innervation

Answer 29

Tibial nerve (S1, S2)

Question 30

Soleus origin

Answer 30

- posterior aspect of head of fibula - superior 1/4 of fibula - soleal line - medial border of tibia

Question 31

Soleus insertion

Answer 31

Posterior surface of calcaneus via tendo calcaneus

Question 32

Soleus action

Answer 32

- plantar flexes foot | - raises heel during walking

Question 33

Soleus innervation

Answer 33

Tibial nerve (S1, S2)

Question 34

Plantaris origin

Answer 34

- inferior end of lateral supracondylar line of femur | - oblique popliteal ligament

Question 35

Plantaris insertion

Answer 35

Fuses with tendo calcaneus

Question 36

Plantaris action

Answer 36

Weakly assists in plantarflexion and flexion of knee

Question 37

Plantaris innervation

Answer 37

Tibial nerve (S1, S2)

Question 38

Popliteus origin

Answer 38

- lateral surface of lateral condyle of femur | - lateral meniscus

Question 39

Popliteus insertion

Answer 39

posterior surface of tibia, superior to soleal line

Question 40

Popliteus action

Answer 40

-weakly flexes knee and unlocks it | rotates femur lateral on fixed tibia) or (medically rotates tibia on fixed femur

Question 41

Popliteus innervation

Answer 41

Tibial nerve (L4, L5, S1)

Question 42

Flexor Hallucis longus origin

Answer 42

- inferior 2/3 of posterior surface of fibula | - inferior part of interosseus membrane

Question 43

Flexor Hallucis longus insertion

Answer 43

Base of distal phalanx of hallux

Question 44

Flexor Hallucis longus action

Answer 44

- Flexes hallux at all joints - plantar flexes foot - supports longitudinal arch of foot

Question 45

Flexor Hallucis longus innervation

Answer 45

Tibial nerve (S2, S3)

Question 46

Flexor digitorum longus

Answer 46

- medial part of posterior surface of tibia inferior to soleal line - by broad aponeurosis to fibula

Question 47

Flexor digitorum longus insertion

Answer 47

Bases of distal phalanges of lateral 4 digits

Question 48

Flexor digitorum longus action

Answer 48

- flexes lateral 4 digits - plantarflexes foot - supports medial longitudinal arch of foot

Question 49

Flexor digitorum longus innervation

Answer 49

Tibial nerve (S2, S3)

Question 50

Tibialis posterior origin

Answer 50

- interosseus membrane - posterior surface of tibia inferior to soleal line - posterior surface of fibula

Question 51

Tibialis posterior insertion

Answer 51

- tuberosity of navicular - all three cuneiform bones - bases of 2nd, 3rd, and 4th metatarsals

Question 52

Tibialis posterior action

Answer 52

- plantarflexes and inverts foot | - supports the transverse and medial longitudinal arch

Question 53

Tibialis posterior innervation

Answer 53

Tibial nerve (L4, L5)