Muscles of Leg

Question 1

gastrocnemius

Answer 1

I: tibial nerve
O: posterior aspect of medial and lateral femoral condyles
I: calcaneus via the calcaneal, or Achilles, tendon
A: plantar flexion of the foot, flexion of the leg

Question 2

soleus

Answer 2

I: tibial nerve
O: posterior surface of the head and proximal 1/3 of the shaft of the fibula; soleal line and middle 1/3 of the postero-medial border of the tibia
I: calcaneus via the calcaneal, or Achilles, tendon
A: plantar flexion of the foot

Question 3

plantaris

Answer 3

I: tibial nerve
O: inferior posterior portion of the lateral supracondylar line of the femur
I: calcaneus, medial to the calcaneal tendon
A: plantar flexion of the foot, flexion of the leg

Question 4

popliteus

Answer 4

I: tibial nerve
O: posterior lateral condyle of the femur
I: postero-medial surface of the tibia superior to the soleal line
A: flexion and medial rotation of the leg; brings the knee out of full extension

Question 5

tibialis posterior

Answer 5

I: tibial nerve
O: posterior surface of tibia, fibula, and interosseous membrane
I: navicular tuberosity; plantar surfaces of all tarsal bones except the talus; plantar surfaces of the bases of 2nd, 3rd and 4th metatarsals
A: plantar flexion, inversion of the foot; supports the arch

Question 6

flexor digitorum longus

Answer 6

I: tibial nerve
O: posterior surface of the tibia
I: plantar surface of the bases of the distal phalanges of the lesser toes
A: plantar flexion of lesser toes and foot; inversion of foot

Question 7

flexor hallucis longus

Answer 7

I: tibial nerve
O: distal 2/3 of posterior fibula and interosseous membrane
I: plantar surface of base of distal phalanx of great toe
A: plantar flexion of great toe and foot; inversion of foot

Question 8

tibialis anterior

Answer 8

I: deep peroneal nerve
O: lateral condyle of the tibia; proximal 2/3 of lateral surface of the tibia; interosseous membrane
I: plantar surface of the base of the 1st metatarsal; medial plantar surface of 1st cuneiform
A: dorsiflexion and inversion of the foot

Question 9

extensor hallucis longus

Answer 9

I: deep peroneal nerve
O: middle 1/2 of anterior fibula; interosseous membrane
I: dorsum of base of distal phalanx of the great toe
A: dorsiflexion, or extension, of the great toe; dorsiflexion and inversion of the foot

Question 10

extensor digitorum longus

Answer 10

I: deep peroneal nerve
O: lateral condyle of tibia; anterior head and shaft of fibula; interosseous membrane
I: dorsum of middle and distal phalanges of lesser toes
A: dorsiflexion, or extension, of lesser toes; dorsiflexion and eversion of foot

Question 11

peroneus tertius

Answer 11

I: deep peroneal nerve
O: distal 1/3 of anterior fibula and interosseous membrane
I: dorsum of base of 5th metatarsal
A: dorsiflexion and eversion of the foot

Question 12

peroneus longus

Answer 12

I: superficial peroneal nerve
O: head and proximal 2/3 of lateral shaft of fibula; lateral condyle of tibia
I: lateral plantar surface of 1st cuneiform and base of 1st metatarsal
A: plantar flexion and eversion of the foot

Question 13

peroneus brevis

Answer 13

I: superficial peroneal nerve
O: distal 2/3 of lateral shaft of fibula
I: tuberosity of base of 5th metatarsal
A: plantar flexion and eversion of the foot