Posterior comp of leg

Question 1

What are the muscles in the superficial layer of the posterior compartment of the leg? what is their innervation?
And what is their common function?

Answer 1

Gastronemius
Soleus
Plantaris

Innervation = Tibial Nerve (S1, S2)
common function = plantar flexion

Question 2

what are the deep muscles of the posterior compartment of the leg?

What is their innervation?

Answer 2

Popliteus
Flexor Digitorum Longus
Flexor Hallucis longus
Tibialis Posterior

Innervation = Tibial nerve

Question 3

What is the origin of Gastronemius?

Answer 3

Medial head = Posterior surface of the distal Femur

Lateral head = Upper Posterolateral surface of LATERAL FEMORAL CONDYLE

Question 4

What is the insertion of Gastrocnemius?

Answer 4

Via CALCANEAL TENDON to posterior surface of calcaneus.

Question 5

What is the innervation of Gastrocnemius?

Answer 5

Tibial nerve

S1, S2

Question 6

What is the action of gastrocnemius?

Answer 6

Plantar flexion of foot

Flexes knee

Question 7

What is the origin of Plantaris?

Answer 7

Inferior part of the LATERAL SUPERCONDYLAR LINE of FEMUR.

Oblique popliteal ligament of knee

Question 8

What is the insertion of Plantaris?

Answer 8

Via CALCANEAL TENDON to posterior surface of Calcaneus.

Question 9

What is the innervation of Plantaris?

Answer 9

Tibial Nerve

S1, S2

Question 10

what is the action of plantaris?

Answer 10

Plantar flexes foot

Flexes knee

Question 11

What is the origin of Soleus?

Answer 11

Soleal line (on tibia)
Medial border of TIBIA
Posterior aspect of FIBULAR HEAD.
Adjacent surfaces of neck of fibular
Proximal shaft of FIBULA
Tendinous between tibial and fibular attachments

Question 12

What is the insertion of Soleus?

Answer 12

Via Calcaneal tendon to posterior surface of calcaneus

Question 13

What is the innervation of Soleus?

Answer 13

Tibial Nerve

S1, S2

Question 14

What is the action of Soleus?

Answer 14

Plantar-Flexes the foot

Question 15

What is the origin of popliteus?

Answer 15

Lateral Femoral Condyle

Question 16

What is the insertion of popliteus?

Answer 16

Posterior surface of proximal tibia

Question 17

What is the innervation of popliteus?

Answer 17

Tibial nerve

L4, L5, S1

Question 18

what is the action of popliteus?

Answer 18

Stabilizes knee joint by resisting lateral rotation of tibia on femur.

UNLOCKS knee joint by laterally rotating femur on fixed tibia.

Question 19

What is the origin of Flexor Digitorum Longus?

Answer 19

Medial surface of TIBIA

Question 20

What is the insertion of Flexor digitorum longus?

Answer 20

Plantar surface of bases of distasl phalanges of the lateral 4 toes

Question 21

What is the innervation of Flexor digitorum longus?

Answer 21

Tibial Nerve

S2, S3

Question 22

What is the action of the Flexor Digitorum Longus?

Answer 22

Flexes the lateral 4 toes

Question 23

What is the origin of Flexor hallucis longus?

Answer 23

Posterior surface of the fibula

and ajacent interosseous membrane

Question 24

What is the insertion of Flexor hallucis longus?

Answer 24

Plantar surface of the distal phalanx of the great toe

Question 25

what is the innervation of flexor hallucis longus?

Answer 25

Tibial nerve (S2, S3)

Question 26

what is the action of flexor hallucis longus?

Answer 26

flexes great toe

Question 27

What is the origin of tibialis posterior?

Answer 27

Interosseous membrane between tibia and fibula
and
posterior surface of tibia and fibula

Question 28

What is the insertion of tibialis posterior?

Answer 28

Plantar surface of medial tarsal bones

Question 29

What is the innervation of tibialis posterior?

Answer 29

Tibial Nerve

Question 30

What is the action of tibialis posterior?

Answer 30

Inverts foot.

Plantarflexion