Mucles of the Leg

Question 1

Soleus

Answer 1

I: tibial nerve
O: posterior surface of the head & proximal 1/3 of the shaft of the fibula; soleal line and midline 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 2

Plantaris

Answer 2

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 3

Popliteus

Answer 3

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

Question 4

Tibialis posterior

Answer 4

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 the 2nd, 3rd, & 4th metatarsals
A: plantar flexion, inversion of the foot: supports the arch

Question 5

Flexor digitorum longus

Answer 5

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 & foot; inversion of foot

Question 6

Flexor Hallucis Longus

Answer 6

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

Question 7

Tibialis Anterior

Answer 7

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 8

Extensor Hallucis Longus

Answer 8

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 & inversion of the foot

Question 9

Extensor digitorum longus

Answer 9

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

Question 10

Peroneus Tertius

Answer 10

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

Question 11

Peroneus Longus

Answer 11

I: superficial peroneal nerve
O: head & 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 & eversion of the foot

Question 12

Peroneus brevis

Answer 12

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

Question 13

Gastrocnemius

Answer 13

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