Plantarflexors of the Ankle

Question 1

Gastrocnemius

Answer 1

O: medial and lateral condyles of the femur
I: via the Achilles tendon into posterior surface of the calcaneus
N: Tibial nerve S1, S2
A: plantarflexion of the ankle. Flexion of the knee joint

Question 2

Soleus

Answer 2

O: soleal line on posterior surface of tibia, posterior surface of upper third of fibula and fibrous arch between the 2.
I: via the Achilles tendon into the posterior surface of the calcaneus
N: tibial nerve S1, S2
A: plantarflexion of the ankle, postural muscle. The soleal muscle pump aids venous return

Question 3

Plantaris

Answer 3

O: lateral supracondylar ridge and popliteal surface of the femur
I: via the Achilles tendon into the posterior surface of the calcaneus
N: tibial nerve S1, S2
A: weak plantarflexion of the ankle and weak flexion of the knee

Question 4

Tibialis Posterior

Answer 4

O: upper 1/2 of lateral aspect of posterior surface of tibia, interosseous membrane and posterior surface of the fibula
I: tubercle on medial aspect of navicular, medial cuneiform & tendinous slips to most of the tarsal bones.
N: tibial nerve L4, L5
A: inversion of the foot and plantarflexion of the ankle.

Question 5

flexor digitorum longus

Answer 5

O: medial part of the posterior surface of the tibia
I: distal phalanx of lateral 4 toes
N: tibial nerve L5, S1, S2
A: flexion of the lateral 4 toes, plantarflexion of the ankle

Question 6

flexor hallicus longus

Answer 6

O: lower 2/3rd of the posterior surface of the fibula
I: base of distal phalanx of great toe
N: Tibial Nerve S1, S2
A: flexion of all the joints of the great toe.