test 4 posterior leg

Question 1

superficial posterior leg muscles

Answer 1

• Gastrocnemius
• Soleus
• Plantaris

Question 2

Gastrocnemius: Lateral head (LG) origin

Answer 2

Lateral aspect of lateral condyle of femur

Question 3

Gastrocnemius: Lateral head (LG) insertion

Answer 3

Posterior surface of calcaneus via calcaneal tendon

Question 4

Gastrocnemius: Lateral head (LG) innervation

Answer 4

Tibial nerve (S1, S2)

Question 5

Gastrocnemius: Lateral head (LG) action

Answer 5

Plantarflexes ankle when knee is extended; raises heel during walking, and flexes leg at knee joint

Question 6

Gastrocnemius: Medial head (MG) origin

Answer 6

popliteal surface of femur, superior to medial condyle

Question 7

Gastrocnemius: Medial head (MG) insertion

Answer 7

Posterior surface of calcaneus via calcaneal tendon

Question 8

Gastrocnemius: Medial head (MG) innervation

Answer 8

Tibial nerve (S1, S2)

Question 9

Gastrocnemius: Medial head (MG) action

Answer 9

Plantarflexes ankle when knee is extended; raises heel during walking, and flexes leg at knee joint

Question 10

Soleus (SOL) origin

Answer 10

Posterior aspect of head of fibula, superior quarter of posterior surface of fibula, soleal line, and medial border of tibia

Question 11

Soleus (SOL) insertion

Answer 11

Posterior surface of calcaneus via calcaneal tendon

Question 12

Soleus (SOL) innervation

Answer 12

Tibial nerve (S1, S2)

Question 13

Soleus (SOL) action

Answer 13

Plantarflexes ankle; steadies leg on foot

Question 14

Plantaris (P) origin

Answer 14

Inferior end of lateral supracondylar line of femur and oblique popliteal ligament

Question 15

Plantaris (P) insertion

Answer 15

Posterior surface of calcaneus via calcaneal tendon

Question 16

Plantaris (P) innervation

Answer 16

Tibial nerve (S1, S2)

Question 17

Plantaris (P) action

Answer 17

Plantarflexes ankle; steadies leg on foot

Question 18

Deeep posterior leg muscles

Answer 18

• Popliteus
• Flexor Hallucis Longus
• Flexor Digitorum Longus
• Tibialis Posterior

Question 19

Popliteus origin

Answer 19

Lateral surface of lateral condyle of femur and lateral meniscus

Question 20

Popliteus insertion

Answer 20

Posterior surface of tibia, superior to soleal line

Question 21

Popliteus innervatio

Answer 21

Tibial nerve (L4, L5, S1)

Question 22

Popliteus action

Answer 22

Weakly flexes knee and unlocks it by laterally rotating femur on fixed tibia, or medially rotating tibia of unplanted limb

Question 23

Flexor hallucis longus (FHL) origin

Answer 23

Inferior two thirds of posterior surface of fibula and inferior part of interosseous membrane

Question 24

Flexor hallucis longus (FHL) insertion

Answer 24

Base of distal phalanx of great toe (hallux)

Question 25

Flexor hallucis longus (FHL) innervation

Answer 25

Tibial nerve (S2, S3)

Question 26

Flexor hallucis longus (FHL) action

Answer 26

Flexes great toe at all joints; weakly plantarflexes ankle; supports medial longitudinal arch of foot

Question 27

Flexor digitorum longus (FDL) origin

Answer 27

Medial part of posterior surface of tibia inferior to soleal line and by a broad tendon to fibula

Question 28

Flexor digitorum longus (FDL) insertion

Answer 28

Bases of distal phalanges of lateral four digits

Question 29

Flexor digitorum longus (FDL) innervation

Answer 29

Tibial nerve (S2, S3)

Question 30

Flexor digitorum longus (FDL) action

Answer 30

Flexes lateral four digits; plantarflexes ankle; supports longitudinal arches of foot

Question 31

Tibialis posterior (TP) origin

Answer 31

Interosseous membrane, posterior surface of tibia inferior to soleal line, and posterior surface of fibula

Question 32

Tibialis posterior (TP) insertion

Answer 32

Primarily to tuberosity of navicular; also to cuneiforms, cuboid and bases of 2nd–4th metatarsals

Question 33

Tibialis posterior (TP) innervation

Answer 33

Tibial nerve (L4, L5)

Question 34

Tibialis posterior (TP) action

Answer 34

Plantarflexes ankle; inverts foot; supports medial longitudinal arch of foot