Features of the leg

Question 1

What is the action and innervation of the tibialis anterior, extensor hallucis longus, extensor digitorum longus and fibularis tertius?

Answer 1

-Action
dorsiflex and invert the foot, and extend the toes
-innervation
the deep fibular nerve (branch of the common finular nerve)

Question 2

What is the origin and insertion of the Tibialis anterior?

Answer 2

o: lateral surface of the tibia and adjacent interosseous membrane
i: medial cuneiform and base of the first metatarsal

Question 3

What is the action of the Tibialis anterior?

Answer 3

Dorsiflexion and inversion of the foot and supporting the medial arch of the foot

Question 4

What is the innervation of the Tibialis anterior?

Answer 4

deep fibular nerve

Question 5

What is the blood supply of the Tibialis anterior?

Answer 5

Anterior tibial artery

Question 6

What is the origin and insertion of the Extensor hallucis longus?

Answer 6

o: medial surface of fibula and adjacent surface of the interosseous membrane
i: base of distal phalanx of the great toe

Question 7

What is the action of the extensor hallucis longus?

Answer 7

Extension of the great toe and dorsiflexion foot

Question 8

What is the innervation of the Extensor hallucis longus?

Answer 8

deep fibular nerve

Question 9

What is the blood supply of the Extensor hallucis longus?

Answer 9

Anterior tibial artery

Question 10

What is the origin and insertion of the Extensor digitorum longus?

Answer 10

o: lateral condyle of the tibia and medial surface of the fibula
i: middle of the distal phalanges of the lateral four toes

Question 11

What is the action of the Extensor digitorum longus?

Answer 11

extension of the lateral four toes and dorsiflextion of the foot

Question 12

What is the innervation of the Extensor digitorum longus?

Answer 12

deep fibular nerve

Question 13

What is the blood supply of the Extensor digitorum longus?

Answer 13

anterior tibial artery

Question 14

What is the origin and innervation of the Fibularis tertius?

Answer 14

o: medial surface of the fibula
i: the fifth metatarsal

Question 15

What is the action of the Fibularis tertius?

Answer 15

Dorsiflexion and evertion of the foot

Question 16

What is the innervation of the Fibularis tertius?

Answer 16

deep fibular nerve

Question 17

What is the blood supply of the Fibularis tertius?

Answer 17

Anterior tibial artery

Question 18

What is the attachments of the Gastrocnemius?

Answer 18

• The lateral head originates from the lateral femoral condyle.
  The medial head originates from the medial femoral condyle.
• the two heads combine to form a single muscle belly
• distally, the muscle belly converges with the soleus muscle to form the calcaneal tendon. This inserts onto the calcaneus

Question 19

What is the action of the Gastrocnemius?

Answer 19

Plantarflexion at the ankle joint and flexion at the knee joint

Question 20

what is the innervation of the Gastrocnemius?

Answer 20

tibial nerve

Question 21

What is the attachments of the Soleus?

Answer 21

Originates from the soleal line of the tibia and proximal fibula.
The muscle converges with the fibres of the Gastrocnemius to form the calcaneal tendon, which inserts onto the calcaneus

Question 22

What is the action of the Soleus?

Answer 22

Plantarflexion of the foot at the ankle joint

Question 23

What is the attachments of the Plantaris?

Answer 23

Originates from the lateral supracondylar line of the femur.
The fibres condense into a tendon which travels down the leg, between the gastrocnemius and soleus muscles.
It blends with the calcaneal tendon and inserts onto the calcaneus

Question 24

What is the action of the Plantaris?

Answer 24

contributes to plantarflexion at the ankle joint and flexion at the knee joint

Question 25

What is the innervation of the Plantaris?

Answer 25

tibial nerve