Posterior muscles of lower leg

Question 1

Origin of gastocnemius?

Answer 1

Medial head: posterior aspect of medial condyle of femur, popliteal surface of femoral shaft
Lateral head: Posterolateral aspect of lateral condyle of femur

Question 2

Insertion of gastocnemius?

Answer 2

Posterior surface of calcaneus via the tendocalcaneus

Question 3

Action of gastocnemius?

Answer 3

Plantarflexion at the talocrural joint, flexion at the knee joint

Question 4

Innervation of gastocnemius?

Answer 4

Tibial nerve (S1-S2)

Question 5

Origin of soleus?

Answer 5

Medial border of proximal tibia, head of fibula, posterior border of proximal fibula, soleal line

Question 6

Insertion of soleus?

Answer 6

Posterior surface of calcaneus via the tendocalcaneus

Question 7

Action of soleus?

Answer 7

Plantarflexion at the talocrural joint

Question 8

Innervation of soleus?

Answer 8

Tibial nerve (S1-S2)

Question 9

Origin of plantaris?

Answer 9

Lateral supracondylar line of femur, oblique popliteal ligament of knee

Question 10

Insertion of plantaris?

Answer 10

Dorsum of the calcaneus medial to the tendocalcaneus

Question 11

Action of plantaris?

Answer 11

Flexion at knee joint, plantarflexion at talocrural joint

Question 12

Innervation of plantaris?

Answer 12

Tibial nerve (S1-S2)

Question 13

Origin of popliteus?

Answer 13

Lateral condyle of femur

Question 14

Innervation of popliteus?

Answer 14

Tibial nerve (L4-S1)

Question 15

Action of popliteus?

Answer 15

Medial rotation of knee joint, flexion of the knee joint

Question 16

Insertion of popliteus?

Answer 16

Posterior surface of proximal tibia

Question 17

Origin of tibialis posterior?

Answer 17

Adjacent margins of the tibia and fibula, interosseous membrane

Question 18

Insertion of tibialis posterior?

Answer 18

Tuberosity of navicular bone, all cuneiform bones, bases of metatarsal bones 2-4

Question 19

Action of tibialis posterior?

Answer 19

Plantarflexion at talocrural joint, inversion at subtalar joint, supports medial longitudinal arch of foot

Question 20

Innervation of tibialis posterior?

Answer 20

Tibial nerve (L4-L5)

Question 21

Origin of flexor hallucis longus?

Answer 21

distal 2/3 of posterior surface of fibula, interosseous membrane, posterior intermuscular septum of leg, fascia of tibialis posterior

Question 22

Insertion of flexor hallucis longus?

Answer 22

Base of distal 1st phalanx

Question 23

Action of flexor hallucis longus?

Answer 23

Flexion at metatarsophalangeal and interphalangeal joint 1, inversion at subtalar joint, plantarflexion at talocrural joint

Question 24

Innervation of flexor hallucis longus?

Answer 24

Tibial nerve (S2-S3)

Question 25

Origin of flexor digitorum longus?

Answer 25

Posterior surface of tibia (inferior to soleal line)

Question 26

Insertion of flexor digitorum longus?

Answer 26

Bases of distal phalanges of digits 2-5

Question 27

Action of flexor digitorum longus?

Answer 27

Flexion at metatarsophalangeal and interphalangeal joint 1, inversion at subtalar joint, plantarflexion at talocrural joint

Question 28

Innervation of flexor digitorum longus?

Answer 28

Tibial nerve (L5-S2)