Lower leg muscles

Question 1

Tibialis posterior origin

Answer 1

Proximal, posterior shafts of the tibia and fibula and the interosseous membrane.

Question 2

Tibialis posterior insertion

Answer 2

All five tarsal bones and the bases of the second through fourth metatarsals.

Question 3

Tibialis posterior actions

Answer 3

Invert the foot at the subtalar joint and plantarflex the foot at the talocrural joint.

Question 4

Tibialis posterior innervation

Answer 4

Tibial nerve

Question 5

Tibialis posterior palpation key

Answer 5

Locate the medial malleolus, then slide posteriorly and proximally. Resist inversion.

Question 6

Fibularis brevis origin

Answer 6

Distal two thirds of the lateral fibula

Question 7

Fibularis brevis insertion

Answer 7

Tuberosity of the fifth metatarsal

Question 8

Fibularis brevis actions

Answer 8

Evert the foot at the subtalar joint, assist to plantarflex the foot at the talocrural joint.

Question 9

Fibularis brevis innervation

Answer 9

Superficial fibular nerve

Question 10

Fibularis brevis palpation key

Answer 10

Side-lying, resist eversion

Question 11

Popliteus oirigin

Answer 11

Lateral condyle of the femur

Question 12

Popliteus insertion

Answer 12

Proximal, posterior aspect of the tibia

Question 13

Popliteus actions

Answer 13

Medially rotate the flexed knee and flex the knee

Question 14

Popliteus innervation

Answer 14

Tibial nerve

Question 15

Popliteus palpation key

Answer 15

Prone with the knee flexed. Locate the tibial tuberosity and slide medially. Curl the fingers onto the posterior shaft of the tibia.

Question 16

Plantaris origin

Answer 16

Lateral supracondylar line of the femur

Question 17

Plantaris insertion

Answer 17

Calcaneus via the calcaneal tendon

Question 18

Plantaris Actions

Answer 18

Weak plantarflexion of the ankle and weak flexion of the knee

Question 19

Plantaris innervation

Answer 19

Tibial nerve

Question 20

Plantaris palpation key

Answer 20

Prone with knee flexed, feel above the gatroc heads, moving lateral to medial.

Question 21

Muscles which plantarflex the talocrural joint

Answer 21

Gastrocnemius, soleus, tibialis posterior, fibularis longus and brevis, plantaris

Question 22

Muscles which dorsiflex the talocrural joint

Answer 22

Tibialis anterior, extensor digitorum longus

Question 23

Muscles which invert the foot

Answer 23

Tibialis anterior and posterior

Question 24

Muscles which evert the foot

Answer 24

Fibularis longus and brevis, extensor digitorum longus